About 500 million years ago, not a single creature had a skull. Over time, these bony plates evolved into the structural marvels that vertebrates—animals with spinal cords, aka you, me, and your pug, ...

: Some sci-fi aliens feel made up on the spot. Others seem so fully realized they could exist. This video explores the species with the deepest lore, logic, and worldbuilding in science fiction.

In these science fiction books, extraterrestrial beings are sympathetic, horrifying and everything in between.

Republican Rep. Nancy Mace of South Carolina has introduced legislation that would make illegal immigrants who engage in animal cruelty inadmissible to the United States and subject to deportation.

BEIJING -- China decided to begin a one-year action plan to prevent invasive alien species from entering border ports across ...