Sharks seem to have it all figured out, evolution-wise. Fossils of prehistoric sharks go all the way back to 450 million years ago, and sharks like the ones we know today emerged about 200 million years ago. This means that they survived the mass extinction that took out the dinosaurs and lived long before early human ancestors evolved less than two million years ago. So, what makes a shark a shark? Here are just a few of its unique physical features: Read more about What Makes a Shark a Shark?
These are just a few different ways that fathers from the animal kingdom stay involved as parents: Jawfishes jawfish.jpg Yellowhead jawfish. Photo via Flickr user Kevin Bryant. Read more about Dedicated Animal Dads That Care for Their Young
As we humans get ready to beat the summer heat, we’re taking a look at different ways animals thermoregulate, or keep internal body temperature stable. Here are just a few ways animals stay chill: Read more about Five Ways Animals Keep Their Cool