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The thyroid gland consists of two types of hormone-producing cells that regulate the body's metabolism and calcium balance. In mammals, these cell types merge into a single organ, whereas in other vertebrates, they develop into separate organs. How this fusion occurs has long rem

Nature is not doing well in Australia. Many unique mammals, birds and insects are struggling. Entire ecosystems are collapsing.

An eight-year international research effort has produced the most comprehensive review of Honduras' mammals since 1998, verifying 227 native species across 146 genera and 42 families, along with three introduced rodent species. The study, published in the open-access journal ZooK

A new study from the University of Kansas complicates the picture of primates living in North America some 55 million years ago during the Eocene, a warm period that allowed mammals to diversify quickly.

The beady-eyed, Pokémon-like leaf sheep is far more ingenious than us land mammalsRevealed: the top 10 invertebrates of the yearInvertebrate of Year Q&A: discuss our countdown with Patrick BarkhamA neon green punk sheep that lives underwater. A solar-powered slug that can perform

In southeastern Madagascar, patches of forest that were once cut down to make way for farms are slowly regenerating naturally after being left to lie fallow. But recovering a native forest needs more than just gaining tree cover. The animals that once lived in these forests also

Dinosaurs conquered the land at enormous sizes, but strangely, they almost never evolved into truly tiny animals. New research suggests that physiology alone can’t explain this missing miniature end of the dinosaur spectrum—and that early mammals may have been partly responsible.

Ants make up one of the most diverse groups of animals on the planet, with many species boasting remarkable physical abilities and social behaviors, and an overall species richness that far exceeds that of mammals. Various types of ants can carry up to one hundred times their wei