7 STASHED IDEAS
Shark skeletons are very different from those of bony fish and terrestrial vertebrates. Sharks and other cartilaginous fish (skates and rays) have skeletons made of cartilage and connective tissue.
Cartilage is flexible and durable but is about half the normal density of bone.
Well, it is true that they are mammals, but dolphins only have hair when they are first born. This hair is found on the top of the rostrum, which is the dolphin's mouth, and falls out within two weeks. Dolphins do not grow any other hair for the rest of their lives.
Dogs belong to the taxonomic family Canidae (canines) which is divided into two tribes:
A couple of canine species lay outside these two tribes, but hyenas are not canines.
Sharks have swum in the oceans for almost 450 million years. But longevity is only part of the story.
That extra few million years of evolution have enabled many shark species to develop some extraordinary abilities as perfect predators.
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