Surprisingly, genome comparisons have failed to resolve a major question in animal evolution: Which living animals are the descendants of the earliest animals to evolve in the world's oceans?

This blog post addresses behavior across all animal species. It considers what we can learn about behavior when we do not limit our study to just humans. Studying nonhuman animal behaviors is ...

All animals are related to each other, but comb jellies — a marine invertebrate found in oceans around the world — are the most distantly related to all other animals, shows a new study in Nature.

A team led by UC Riverside geologists has discovered the first ancestor on the family tree that contains most familiar animals today, including humans. The tiny, wormlike creature, named Ikaria ...