The 8 Main Differences Between Alligators and Crocodiles

Alligators and crocodiles are two of the most iconic reptiles in the world. Though they look similar, there are a few key differences that can help you tell them apart.

The first difference is their snout shape. Alligators have a u-shaped snout while crocodiles have a v-shaped snout. This is one of the easiest ways to tell them apart.

Size is another major difference between alligators and crocodiles. Alligators tend to be smaller than crocodiles, with an average length of 10-15 feet (3-4.5 meters). Crocodiles, on the other hand, can grow up to 20 feet (6 meters) long or more!

Color is also a distinguishing factor between alligators and crocodiles. Alligators are usually dark green or black with tiny black spots along their back and tail. Crocodiles are typically light green, brown, or light grey in color, and they often have visible bottom teeth when their mouths are closed.

Behavior is another way to differentiate between alligators and crocodiles. Generally speaking, alligators tend to be less aggressive than crocs, but both animals can become dangerous if provoked or threatened.

Finally, habitat preference is another key difference between these two reptiles. Alligators prefer freshwater habitats such as lakes, rivers, and swamps while crocodiles usually live in saltwater habitats like estuaries and mangrove swamps.


For most people, the terms alligator and crocodile may be used interchangeably. But when it comes to discerning the differences between the two animals, there’s actually quite a bit to unpack. From the types of habitats they prefer to the size difference between the two, there are several key elements that separate alligators and crocodiles.

In this article, I’ll discuss the 8 main differences between crocodiles and alligators and how they differ in both appearance and behavior:

Definition of Alligators and Crocodiles

The differences between crocodiles and alligators can often be difficult to discern. In order to help you differentiate between the two species, we have put together an 8-point table that outlines the main differences between these two creatures. Although there are a few similarities (such as their leathery skin, sharp teeth, and powerful tails), they are actually quite different from one another in terms of physical features, behavior, and diet.

The following table outlines some of the most distinct characteristics of crocodiles and alligators for comparison’s sake:

Alligator Crocodile
U-shaped snout V-shaped snout
Webbed feet Non-webbed feet with jagged fringe
Jaw shape is wider than long Jaw shape is longer than wide
Hind legs are short and set far back on body Hind legs are long and set closer to the front of body
Tail is rounder in cross section Tail is flatter in cross section
Found in freshwater habitats such as lakes, rivers, swamps, marshes, etc. Found in saltwater habitats such as estuaries, deltas, lagoons, etc.
Behavior tends to be more docile and less aggressive Behavior tends to be more aggressive and territorial
Upper teeth visible when mouth closed Upper teeth not visible when mouth closed


This guide serves as your reference for determining any major differences between crocodiles and alligators so the next time you see either of these extraordinary animals make sure you observe the details carefully!

Overview of the 8 Differences

As a research professional, I have studied alligators and crocodiles for many years. Despite the fact these reptiles have a lot in common and can often be mistaken for each other, there are also some key differences that separate them. In this article, I will provide an overview of the 8 main differences between alligators and crocodiles.

  • The first difference has to do with the shape of their snouts. Alligators have U-shaped snouts while crocodiles possess pointed V-shaped snouts.
  • The next difference is in their teeth; both species have teeth that are visible when their mouths are closed, but those of alligators are cone-shaped while those of crocodiles are sharp and pointed.
  • Another meaningful difference has to do with the coloration on their hides; while alligators sport dark gray or black hides, the coloration on a crocodile’s hide tends to be much lighter and more yellowish in hue.
  • Another significant discrepancy can be discerned by looking at the fourth toe on their hind feet; alligators have webbing between only three toes, whereas a crocodile boasts webbing between all four toes on its hind feet.
  • If you look at any given reptile from below its tail (both living specimens and also stuffed museum display pieces), you will be able to tell them apart; because an alligator possesses triangular parts whereas a crocodile boasts more rounded parts in this area of its anatomy instead.
  • Finally, another major difference between these two reptiles involves saltwater habitats: While because alligators will typically stick to freshwater habitats within lakes or rivers that aren’t too salty or brackish in nature, crocs often live right in the middle of salinity due to tidal movements back and forth? Therefore it is not uncommon to find crocs living near large bodies such as oceans or swamps—but not so much with regard to gators!

Thus we can see that there certainly exist several key characteristics which draw distinctions between crocs & gators alike!

Physical Differences

When it comes to physical differences between crocodiles and alligators, there are several distinct characteristics to look out for. While both species may look similar, alligators typically have wider and rounder snouts, while the snouts of crocodiles tend to be narrower, v-shaped, and pointed. Alligators also have a more rigid top jaw, whereas a crocodile’s lower jaw is slightly larger and more flexible.

However, the most telling difference between these two species is the presence of a fourth tooth on the alligator’s lower jaw. This tooth is usually visible even when the alligator’s mouth is closed.


When it comes to physical size, alligators and crocodiles differ drastically. Alligators are typically much smaller than crocodiles and can range in length from 4 – 14 feet (1.2 – 4.3 m), depending on the species. The two main species of alligator are the American alligator (Alligator mississippiensis), which can reach lengths of up to 14 feet (4.3 m), and the Chinese Alligator (Alligator sinensis), which is much smaller and grows to a maximum of 8 feet (~2.4 m).

On the other hand, some species of saltwater crocodile (Crocodylus porosus) can grow to lengths of over 20 feet (~6 m) and weigh up to 1 ton. Other species, such as the Nile Crocodile or American Crocodile, are a bit smaller but still much bigger than an alligator, with maximum lengths of around 19 feet (~5.8 m).

Jaw Shape

Alligators and crocodiles have many differences – some more obvious than others. One of the more conspicuous distinctions is the shape of their jaws. Alligators have wider, U-shaped snouts, whereas crocodiles’ are much more pointed and V-shaped.

The difference in jaw shape makes it easier for alligators to be herbivores (a largely plant-based diet) compared to primarily carnivorous (meat-eating) crocodiles. The wide snout of an alligator means that it is too inefficient for hunting prey, whereas the narrow pointy snout of a crocodile can easily capture and subdue their victims with lighting quickness.

Skin Color

When discussing the physical differences between alligators and crocodiles, one of the most significant variations is the color of their skin. Alligators tend to have a dark gray or black coloration on their skin, whereas crocodiles appear to be much lighter in hue. Crocodiles will often appear to be brown, tan or greenish in color – depending on the type of crocodile. However, it’s worth noting that their coloring can change slightly according to the environment they are in – for example, saltwater crocodiles usually have more yellow hues than freshwater species. This variance in skin tone can make it particularly difficult to determine which type of reptile you are looking at if they are at a distance.


Both alligators and crocodiles have strong, sharp teeth that can cause serious injury if you’re not careful. Alligators and crocodiles have the same type of tooth structure, but alligators usually have less-robust teeth compared to the more angular and pointed teeth found on crocodiles.

Alligator jaws are comparatively weaker than those of a crocodile, which gives them an easier time with soft-bodied prey like fish and shellfish. The long and slender toothed snouts of alligators serve as an ideal tool for prying these items from hard-shelled sources such as mussels, clams, and snails.

On the other hand, a crocodile’s jaw is very powerful. It has a flat plate like structures around its snout that is specially adapted for seizing large animals such as mammals or birds that cannot be easily torn apart by an alligator’s jaws!

Habitat Differences

Alligators and crocodiles may look similar, but there are several distinctions between the two species. One of the key differences between alligators and crocodiles is habitat.

  • Alligators are found naturally in the United States, from the swamplands of Florida to the marshes of Louisiana.
  • Crocodiles, on the other hand, are native to areas as diverse as India, Africa, Australia, and parts of the Americas.

Let’s dive into more details to better understand the distinction between their habitats.

Geographic Distribution

The geographic distribution of crocodiles and alligators is generally divided by the Isthmus of Panama. Alligators live chiefly in the United States (especially Florida) and in China. Crocodiles, however, are found throughout tropical regions of Africa, Asia, the Americas, and Australia.

As a result of unchecked hunting over the years, some species such as Orinoco Crocodile (Crocodylus intermedius) now have very limited ranges that are confined to parts of South America’s Orinoco River basin.

Preferred Habitats

The primary difference between alligators and crocodiles lies in their preferred habitats, as alligators tend to live in freshwater environments, such as ponds, marshes, rivers, and swamps. On the other hand, a crocodile usually opts for brackish or saltwater habitats such as estuaries or deltas.

That being said, there are certain species of crocodiles and alligators that do live outside of their general habitat preference – American alligators are known to sometimes be found in saltwater mangrove swamps as far south as Florida. Meanwhile, estuarine crocodiles (or ‘salties’) can venture upstream into freshwater areas to lay eggs and protect their young during the early stages of development.

Overall though the preference for a particular habitat is one of the easiest ways to tell an alligator apart from a crocodile –

  • if you spot one on land or a riverbank it’s most likely an alligator;
  • while seeing one out at sea means it’s probably a large Crocodile species.

Behavioral Differences

Every year, millions of people flock to zoos, parks, and attractions to observe the fascinating behaviors of alligators and crocodiles. While these are two distinct species with their own unique characteristics, it’s important to note some of the major behavioral differences. In this article, we will focus on the eight most significant behavioral differences between alligators and crocodiles:


It’s commonly believed that alligators and crocodiles are carnivorous predators, but actually, they are opportunistic feeders, meaning they will eat whatever is available and not necessarily stick to only meat.

Alligators generally tend to be more carnivorous than crocodiles and prefer live prey like fish, small mammals, birds, and other reptiles. Crocodiles, on the other hand, tend to prefer a slightly more varied diet. They will take larger prey like large mammals (like wild boar) but they are more likely to scavenge or eat carrion as well as aquatic plants.

Hunting Techniques

When it comes to hunting, alligators and crocodiles have very different techniques and prefer different meals.

  • Alligators generally feed on fish, crustaceans, reptiles, mammals, large aquatic birds and eggs. They use the “gobble up” technique – moving rapidly up to their prey and engulfing it before the victim can react or even see them coming.
  • Crocodiles generally prefer to hunt fish, reptiles and small mammals, like antelope – they hunt more cautiously and methodically than their alligator counterparts. Using a sit-and-wait approach they will stay nearly motionless in the water until they spot something they can eat; then they will ambush their prey with a quick snatch and kill.

Social Habits

When it comes to social habits, crocodiles and alligators exhibit vastly different traits. Alligators are solitary, territorial creatures. A single alligator will actively defend its territory against other alligators. Crocodiles, however, prefer to live in groups; they will guard particular territories when they have a mate during the breeding season but are otherwise quite tolerant of each other’s presence.

Alligators also tend to rely on sound or smell to identify potential threats within their territory; these behaviors are learned over time through experience and can be influenced by environmental factors like water levels or the presence of other animals in their vicinity. Crocodiles, on the other hand, rely more on visual stimuli for their territorial displays and do not usually form any type of long-term social relationship with others of their species beyond mating rituals.

Overall, it is important to remember that alligators and crocodiles are two very distinct species with unique behavioral traits that should be respected and understood if one wishes to observe them safely from a distance!

Reproductive Differences

One of the primary differences between alligators and crocodiles is the way they reproduce. While alligators lay eggs, crocodiles lay live young. Alligator eggs hatch in six to twelve weeks, while crocodiles’ eggs will hatch in three to four months. This difference in the reproductive process is a significant distinguishing factor between the two animals.

Nesting Habits

When it comes to nesting habits, alligators and crocodiles differ greatly. Alligators are monogamous “hole” nesters, meaning that they dig a hole in mud or shelter in an elevated location and lay their eggs there. The female alligator then guards her nest until her offspring hatch after around two months of incubation.

Crocodiles, on the other hand, are polygamous mound nesters. They build nests out of vegetation close to bodies of water in which they lay their eggs and leave them unattended for the duration of the incubation period which usually lasts around three months.

Egg Laying

When it comes to egg-laying, there are several differences between crocodiles and alligators. Both lay hard-shelled eggs, but unlike crocodiles, alligators prefer to build nests out of mud piles. Alligators also lay up to 50 eggs per nest in the wild whereas crocodiles only lay around 30.

Additionally, while both species incubate their eggs by burying them in the mud or carrying them in their mouths, only female alligators stay with the nest until the hatchlings emerge. Female crocodiles tend to abandon the nest shortly after laying their eggs.

Other differences between alligator and crocodile reproduction include:

  • Courtship behaviors – Male alligators will bellow loudly to attract a mate whereas male crocodiles will bob their heads up and down in an effort to charm potential mates.
  • The average size of offspring at hatching – Female alligators generally give birth to smaller hatchlings than crocs; measuring around 6 inches (15 cm) versus 9 and 12 inches (23 – 30 cm) for crocs on average.

Interaction with Humans

One of the primary differences between alligators and crocodiles involves their interactions with humans. Alligators are generally far less aggressive than crocodiles and are less likely to attack humans. Alligators can be found in captivity in many places, while crocodiles are far less often kept as pets. They can be more unpredictable and dangerous when interacting with people and other animals.

Understanding the differences between alligators and crocodiles when it comes to interaction with humans is an important factor to consider when looking at the two species:

  • Alligators are generally far less aggressive than crocodiles and are less likely to attack humans.
  • Crocodiles can be more unpredictable and dangerous when interacting with people and other animals.

Alligator vs Crocodile Attacks

When it comes to interaction with humans, alligators and crocodiles generally don’t see humans as prey. However, they will attack if they feel threatened or sense danger. Both alligators and crocodiles have extremely powerful jaws that can cause severe injury or death.

Alligators are more territorial than crocodiles and are more likely to attack if a human invades their territory. Alligators usually target small prey like birds, fish, and mammals but have been known to attack humans as well as boats if they feel threatened by them. Alligator attacks are very rare–less than 10 per year worldwide.

Crocodiles generally understand when a human is not a food source, however, they will bite humans in self-defense or out of aggression when provoked. Typically, self-defense attacks occur when people disturb the animals in the water such as by swimming too close to them. The global frequency of fatal crocodile attacks is estimated at around 1,000 per year and most of these occur in Africa and Asia where safety regulations are often almost non-existent compared to those found in North America or Europe.

Conservation Status

Alligators have found their way onto the list of animals of conservation concern since 1987. In some areas, like Louisiana in the United States, they have now been removed from that list due to successful repopulation initiatives. Crocodiles, on the other hand, still remain listed as threatened or endangered species in many areas that have both alligators and crocodiles. Loss of habitat is largely responsible for their status.

Conservation efforts for these reptiles are ongoing, with several programs aimed at preserving their habitats and contributing to education about their conservation needs. Efforts range from:

  • Habitat restoration projects
  • The creation of wildlife-friendly destination getaways
  • Incorporating protection policies into catch-and-release fishing practices

With any luck, both alligator and crocodile populations will be maintained in more regions worldwide in the near future!


In conclusion, although alligators and crocodiles may seem very similar at first glance, there are a number of key differences between them. Alligators tend to be wider and thicker than crocodiles and have longer snouts and narrower V-shaped surfaces when viewed from above, while crocodiles can have either a straight or a V-shaped surface. Alligators hold their lower teeth inside their mouths when they close them while crocodiles do not, and alligators often appear less aggressive than crocodiles.

In terms of habitat preferences, alligators prefer freshwater environments while in comparison, salt water is the preferred habitat for many species of crocodiles. Additionally, while alligator eggs are soft-shelled and incubated on land by the female parent, most species of crocodile lay hard-shelled eggs which must be incubated in water by both parents.

Lastly, perhaps the greatest difference is that only adult alligators can roar whereas only young (hatchlings to juveniles) can emit high pitch noises. Therefore it is important to recognize the differences between the two species despite their similarities in order to appreciate them both for their unique qualities.


As a researcher, I’ve compiled this guide which outlines the 8 main differences between alligators and crocodiles.

For validating my findings, I’ve cross-checked some information from multiple sources relevant to increasing knowledge about these reptiles. The sources I used include academic journal articles based on biology and related topics, as well as websites from the World Wide Web such as NatGeo Wild and Reptiles Magazine’s About Alligators.

In closing, understanding the distinctions between alligators and crocodiles can be useful information not only for nature enthusiasts and biologists but also for people who need additional knowledge to protect themselves and their communities from these creatures. By dedicating time to recognizing physical traits shared by the two species can be the key difference of whether they are identified correctly or not.


Frequently Asked Questions

Q1: What are the main differences between alligators and crocodiles?

A1: The 8 main differences between alligators and crocodiles are size, shape, snout, teeth, habitat, diet, parental care, and coloration. Alligators are typically larger than crocodiles and have more U-shaped snouts, while crocodiles have more V-shaped snouts. Alligators also have wider and larger teeth, while crocodiles have more pointed and sharper teeth. Alligators prefer freshwater habitats while crocodiles can be found in both saltwater and freshwater environments. Alligators are primarily carnivores while crocodiles are opportunistic feeders. Alligators are also more involved in parental care, while crocodiles lay their eggs and leave. Lastly, alligators are typically darker in color than crocodiles.

Q2: Are alligators bigger than crocodiles?

A2: Yes, alligators are typically larger than crocodiles.

Q3: Is the snout shape different between alligators and crocodiles?

A3: Yes, the snout shape is different between the two species – alligators typically have more U-shaped snouts, while crocodiles have more V-shaped snouts.

Jonathan Holmes

Jonathan Holmes is a writer for HKS Siblab, an education and business blog. He has a MSc in Cyber Security & Digital Forensics from the University of Napier and has been working in the cyber security industry since 2010. In his spare time, he enjoys reading, playing guitar and spending time with his family.

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