Watch the hilarious battle of wills between mom and baby! From tantrums to triumphs, see who comes out on top in this ...

Megalodons have been portrayed as gigantic great whites, but new research suggests they were more svelte and less agile hunters that got outcompeted.

The megalodon, great white shark and mako shark are not the only warm-blooded marine animals. Others include aquatic mammals such as whales, dolphins, seals, sea lions, walruses and manatees.