A mysterious illness is spreading throughout bird populations in the eastern U.S.

Sperm come in tons of sizes, and it all has to do with how they have to find the egg.

Lifesaving surgery gives a rare bird a leg up.

A new study on human cultural evolution argues that humans evolve much faster as cultures than as individual organisms, molding our genes in the process.

Human and mosquito cell nuclei have their own shapes, and researchers can mold one to look like the other.

An increasingly virulent pathogen is turning hygienic cannibalism on its head.

A new species of Dumbo octopus, nicknamed the Emperor Dumbo, has been dredged up from the deep sea.

A man's lack of friends may predict whether he will embrace toxic masculinity, while the presence or absence of a male role model early in life isn't a factor.

Primeval sea creatures share genes with humans, suggesting that we're more like ancient animals than previously thought.

Octopuses can "see" light with their arms, even when their eyes are in the dark, researchers have found.

Here's why thousands of sea turtles were paralyzed in the frigid waters along the Texas coastline during the unprecedented winter storm that swept across the country this week.

Flat feline faces are stuck in perpetual frowns.