Posts tagged ‘Bones’

Why fish don’t sink?

Fish

A fish, with its bones and scales, is heavier than the water it displaces. Under normal circumstances, it would tend to sink.  But most bony fishes have a balloon-like sac inside their bodies called an “air bladder” that acts as a float to keep them from sinking.  The air bladder fills up with some of the oxygen dissolved in the fish’s blood.

Some fish, such as pike and catfish gulp air at the surface of the water to fill their air bladders.  A shark has no air bladder to buoy it up.  It must constantly be swimming in order to keep from sinking. – Dick Rogers

Why do dogs bury bones?

Dog Bury A Bone

If we remember that our dogs are descended from dogs which lived in a wild state long ago, we can better understand some of their habits.

When a dog buries a bone, it may be because its wild ancestors often buried or cached what food they couldn’t eat in one meal to store it for a future meal, a habit which was necessary to life.

By burying food, a dog digs the hole with its front feet but covers the food with its nose.

Today’s dogs have many of the instinctive habits of their wild ancestors.

For example, a dog may turn around several times before lying down, in much the same way wild dogs trample the grass to make a sheltered bed.

When a dog bays at night, it is probably an ancestral habit from the time when all dogs ran in packs like wolves.

A dog may even roll in fifth to hid its own odor—a trick learned by dogs who hunted ages ago. – Dick Rogers