Beaver teeth are so sharp that Native Americans once used them as knife blades.

The walrus’ most obvious attribute is its pair of long tusks, (40cm) which are actually continuously growing canine teeth.  They not only help it  haul out, but also used in displays of aggression/dominance and to create breathing holes in ice. Contrary to common belief, they are not used to dig for food

The placement of a donkey's eyes in its' heads enables it to see all four feet at all times.

The crow is well known for its ability to detect trouble. Crows quickly learn that a moving car is no danger, but will rapidly flee if the driver stops and gets out. In areas where they are constantly hunted, they learn the difference between a hunter with a gun and a farmer with farming implements.

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