More than a dozen mammal species shimmer and glint purple and green, like precious opals. Their fur is iridescent, meaning its colour appears to change depending on the animal’s orientation relative ...

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Despite a common narrative that male mammals tend to dwarf female ones, fewer than half of mammalian species display that pattern, a new study suggests. By Emily Anthes Female elephant seals are not ...

From the small ossicones of a giraffe to the gigantic antlers of a moose, all these distinct headgears evolved from the same ancestor but are dramatically different in size and shape due to ...

Some of the best known species on Earth may not be what they seem. Credit...Steve Holroyd/Alamy Supported by By Carl Zimmer Naturalists have been trying for centuries to catalog all of the species on ...