Reptiles

A zoo employee weighs a meerkat during the annual weigh-in.

London Zoo Weighs All 14,000 of Its Animals, 'From the Tallest Giraffe to the Tiniest Tadpole'

The annual measurements help zookeepers track each animal's health over time

Shells of turtles and tortoises can accumulate uranium isotopes.

Turtle Shells Keep a Record of Humans' Nuclear History

Scientists can measure uranium isotopes in tortoise and turtle shells to understand the environmental impact of past nuclear events, a new study reports

The Crystal Palace Dinosaurs are the world’s first attempt to model prehistoric animals at full scale.

How a Victorian Dinosaur Park Became a Time Capsule of Early Paleontology

A new sculpture and an upcoming restoration are breathing life into the Crystal Palace Dinosaurs, one of 19th-century Britain’s most curious creations

The snake's new enclosure is specially designed to help the creature avoid hurting itself.

A Rare Two-Headed Snake Is Back on Exhibit at a Texas Zoo

Pancho and Lefty, as the western rat snake is known, has now healed from an injury it suffered more than two years ago

Fossilized poop, called coprolites, collected in Nong Yakong village, Chaiyaphum Province, Thailand. Coprolites are an important source for studying ancient parasites.

200-Million-Year-Old Poop Reveals Parasites That Infected a Crocodile-Like Reptile

The prehistoric fossil could help researchers understand the relationships between parasites and host organisms in the Late Triassic

As one Nile crocodile rests, another perks up near a river in Tanzania.

Nile Crocodiles Recognize and React to the Sound of Crying Babies

The reptiles may be aware that primate infants are in trouble—and an easy meal

A southern Pacific rattlesnake. Previous studies had found examples of companionship reducing stress in birds and mammals, but not reptiles.

Having a Companion Could Help Rattlesnakes Stay Calm

During a stressful event, snakes experienced a smaller spike in heart rate when they were in the presence of another snake, according to a new study

A nesting Hawaiian green sea turtle, or honu in Hawaiian, struggles while trapped in a hole in the sea wall on Tern Island in 2014. This female was rescued, but in 2021 at least seven females died after being trapped on the island.

The Lonely Battle to Save Species on a Tiny Speck in the Pacific

As Tern Island, a former military outpost in the Hawaiian archipelago, falls apart and harms turtles, birds, seals and more, scientists wonder what’s next

An illustration of the Victorian grassland earless dragon, which, until February, had not been seen in the wild since 1969.

Scientists Find the 'Extinct' Victorian Earless Dragon, Not Seen Since 1969

Once thought to be gone from the wild, the lizards will now enter a breeding program in an attempt to save them from the brink of extinction

An artist's interpretation of how a rhynchosaur might have looked

These 'Grinning' Triassic Reptiles Likely Died of Starvation

Sheep-sized rhynchosaurs had an unusual way of chewing plants that wore down their teeth over time

An illustration of a predator decapitating Tanystropheus hydroides

These Long-Necked Marine Reptiles Were Decapitated

Tanystropheus fossils reveal how predators may have snapped the creatures' necks with a powerful, swift bite from above

Reconstruction of an Australian pterosaur

Australia's Oldest Known Pterosaur Fossils Are From 107 Million Years Ago

The tiny bones include the first one from a juvenile found in the country

American crocodiles haven't been known to reproduce via parthenogenesis—until now.

Scientists Record the First 'Virgin Birth' in a Crocodile

A female American crocodile living in captivity reproduced without a mate—a finding that suggests dinosaurs might have done the same thing

Paleontologists discovered Oda's remarkably intact fossilized skeleton in Svalbard in 2008.

Unraveling the Mysteries of Oda the Ichthyosaur

Paleontologists used X-rays to identify the 240-million-year-old creature's flattened and fossilized remains

An illustration of the giant gorgonopsian Inostrancevia scaring off the much smaller African species Cyonosaurus

During the 'Great Dying,' This Saber-Toothed Predator Reigned

This ancestor of mammals briefly thrived amid a massive extinction event, hinting at how carnivores may respond to climate change today

Many giant animals roamed the Earth after non-avian dinosaurs went extinct.

After Dinosaurs Went Extinct, These Ten Giant Creatures Roamed the Earth

Though we often think of the “terrible lizards” as behemoths, many later reptiles and mammals also grew to massive sizes

A Colorado checkered whiptail

These Lizards Stress-Eat When Loud Military Aircraft Fly Overhead

Colorado checkered whiptails on a U.S. Army base show increased stress levels and altered behavior after noisy jets and helicopters pass by, a study finds

Many of the reptiles that thrived during the Triassic were crocodile relatives that dinosaurs would later mimic through evolutionary happenstance, such as Postosuchus (back) and Desmatosuchus (front).

Dinosaurs Were Evolutionary Copycats of These Long-Lost Look-Alikes

Before T. rex and ankylosaurus ruled the Earth, a host of similar Triassic reptiles reigned

A male (silver) and female (brown) common European adder meet prior to mating. Scientists are just beginning to understand female sexual anatomy in snakes.

Why Did Scientists Wait So Long to Study the Snake Clitoris?

The delay is representative of a major problem in biology: Female and intersex animals are understudied compared with their male counterparts

Baofeng Su, a fish genetics researcher at Auburn University, is part of a team of scientists studying the effectiveness of injecting alligator genes into farm-raised catfish.

Scientists Are Injecting Alligator Genes Into Catfish

The technique could help prevent infections in the millions of pounds of farmed catfish raised for human consumption

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