Amber Weaver

Long before dinosaurs, sharks were swimming in our oceans. In fact, sharks have been on this planet for over 400 million years, while dinosaurs lived during the Mesozoic era –– between about 245 and 66 million years ago.

Some scientists say there are signs that dolphins can experience empathy. In many recorded cases, dolphins have gone out of their way to save someone they perceive to be in danger.

Cetaceans are split into two groups: toothed and baleen whales. Orcas are actually the largest species in the dolphin family.