which is currently the second smallest adult vertebrate ever described, only larger than another individual of a different congeneric [belonging to the same genus B. pulex] species,” Professor ...

The history of life on Earth dates back more than 500 million years, when complex-structured organisms emerged during the ...

Animals are divided into two main groups. Animals that have a backbone are called vertebrates. Animals that don't have a backbone are called invertebrates. Vertebrates and invertebrates are ...