Reptiles Species Guide
Cold-blooded, scale-covered air-breathing vertebrates including snakes, lizards, turtles, and crocodilians.
Did You Know?
"No two tigers have the exact same stripe pattern — their stripes are as unique as human fingerprints!"
Reptiles Encyclopedia & Field Guide
Reptiles are ectothermic, amniotic vertebrates possessing keratinized epidermic scales or scutes. By freeing vertebrate reproduction from standing water through the evolution of the cleidoic amniotic egg, reptiles colonized dry terrestrial biomes over 300 million years ago and include modern squamates (snakes and lizards), testudines (turtles), and crocodilians.
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Snake & Reptile Identifier by Picture
Identify snakes, lizards, turtles, and crocodilians. Includes an automatic Snake Safety Check with venom assessment.
How to Tell Venomous from Harmless Snakes
Key physical indicators used by field biologists. Always keep a safe distance regardless of visual indicators.
| Physical Trait | ⚠️ Venomous Pit Vipers | 🟢 Typically Harmless Snakes |
|---|---|---|
| Head Shape | Broad triangular / spade-shaped (pit vipers) | Sleek rounded oval head |
| Eye Pupil Shape | Vertical slit "cat eye" pupil | Round pupil |
| Heat Sensing Pits | Facial pit organ between nostril & eye | No facial heat pit organs |
| Scale Texture | Keeled rough scales with ridges | Smooth glossy flat scales |
Turtle or Tortoise?
Upload a photo to distinguish land tortoises from aquatic turtles and avoid putting non-swimming tortoises in water.
Popular Reptile Comparisons
V-snout vs U-snout & exposed 4th tooth
Smooth slimy skin vs dry warty skin & poison glands
Reptiles Species Guide
Showing 32 species
Green Anole
Anolis carolinensis
A small, active lizard native to North America that can rapidly change color from vibrant emerald green to dark mottled brown based on mood and temperature.
King Cobra
Ophiophagus hannah
The longest venomous snake in the world, capable of expanding a terrifying neck hood and rearing one-third of its body off the ground when threatened.
American Alligator
Alligator mississippiensis
An ancient apex reptile of the American Southeast, characterized by a broad U-shaped snout, dark armored hide, and thunderous bellowing calls.
Nile Crocodile
Crocodylus niloticus
The supreme freshwater predator of Africa, renowned for its tapered V-shaped snout, visible 4th lower tooth, and deadly "death roll" ambush technique.
Komodo Dragon
Varanus komodoensis
The largest living lizard species on Earth, growing up to 3 meters long, armed with shark-like serrated teeth, venom glands, and a yellow forked tongue.
Green Sea Turtle
Chelonia mydas
A large, graceful marine reptile that navigates thousands of miles across open oceans to feed in coastal seagrass meadows and nest on natal tropical beaches.
Eastern Coral Snake
Micrurus fulvius
A slender venomous snake with bright red, yellow, and black bands.
Common Kingsnake
Lampropeltis getula
A nonvenomous snake that often shows banded patterns and may resemble coral snakes.
Northern Water Snake
Nerodia sipedon
A heavy-bodied nonvenomous water snake often confused with cottonmouths.
Cottonmouth
Agkistrodon piscivorus
A venomous semi-aquatic pit viper; adults are often dark and heavy-bodied.
Burmese Python
Python bivittatus
A large constrictor with blotched dorsal patterning.
Boa Constrictor
Boa constrictor
A large New World constrictor with saddle-like markings.
Black Rat Snake
Pantherophis obsoletus
A slender climbing snake; adults are often mostly dark.
Northern Black Racer
Coluber constrictor constrictor
A fast, slender dark snake often confused with rat snakes.
Freshwater Turtle
Testudines (freshwater)
A general freshwater turtle profile used to contrast aquatic turtles with land tortoises.
Red-Eared Slider
Trachemys scripta elegans
A common freshwater turtle with a red patch behind the eye.
Painted Turtle
Chrysemys picta
A freshwater turtle with colorful neck stripes and a smooth shell.
Eastern Box Turtle
Terrapene carolina
A high-domed land turtle with a hinged plastron.
Sulcata Tortoise
Centrochelys sulcata
A large African spurred tortoise with a high-domed shell and stout feet.
Hawksbill Sea Turtle
Eretmochelys imbricata
A marine turtle with overlapping scutes and a hawk-like beak.
Leopard Gecko
Eublepharis macularius
Leopard Gecko — lizard species for identification and encyclopedia pages.
Crested Gecko
Correlophus ciliatus
Crested Gecko — lizard species for identification and encyclopedia pages.
Bearded Dragon
Pogona vitticeps
Bearded Dragon — lizard species for identification and encyclopedia pages.
Green Iguana
Iguana iguana
Green Iguana — lizard species for identification and encyclopedia pages.
Veiled Chameleon
Chamaeleo calyptratus
Veiled Chameleon — lizard species for identification and encyclopedia pages.
Blue-Tongued Skink
Tiliqua scincoides
Blue-Tongued Skink — lizard species for identification and encyclopedia pages.
Inland Taipan
Oxyuranus microlepidotus
An Australian elapid often cited as the world's most venomous snake based on laboratory LD50 testing of its venom toxicity.
Coastal Taipan
Oxyuranus scutellatus
A large, fast Australian elapid with highly toxic venom; more often encountered in coastal and wetter habitats than the inland taipan.
Black Mamba
Dendroaspis polylepis
A large, fast African elapid with potent neurotoxic venom; frequently featured in educational lists of highly venomous snakes.
Boomslang
Dispholidus typus
A slender African colubrid famous for large eyes and potent hemotoxic venom delivered by rear fangs — a reminder that “rear-fanged” does not mean harmless.
Sea Snake
Aipysurus laevis
A representative Indo-Pacific “true” sea snake (Hydrophiinae). Olive sea snakes and related marine elapids have potent venom but are generally not aggressive toward divers.
Gila Monster
Heloderma suspectum
A heavy-bodied venomous lizard of the southwestern United States and northwestern Mexico; one of the few lizards commonly taught as venomous in field guides.
