Why does tail of a house-lizard (gecko) jerk and toss about for some time even after cutting off from the body?

Would it not be discriminatory on the part of Nature to provide many hunting capabilities to predator animals and birds without providing in equal measure of self-protection to the animals and birds which are preyed upon? Without an even handed distribution of skills and abilities the fate of animal world would have been doomed. Not all animals employ the same tactics for protecting themselves from enemies. Some actually pretend to be dead so that the enemy mistaking them for long dead corpses may not eat them. Crabs, starfish, sea slugs etc. cut off and leave behind a thrashing and writhing limb to divert the enemy’s attention.
Nature has made similar arrangements in the bodies of chameleon and house-lizard (gecko). Bones of tail after the sixth bone are loosely joined and the muscles near the joints are also not strong. If and enemy approaching very close is about to bite or snatch, gecko immediately constricts the tail muscles strongly, neatly cutting it loose. Blood vessels are also squeezed with the tail mussels so bleeding does not take place. In fact bleeding would indicate that tail was cut off by some accident and the enemy would continue to chase gecko. Tossing and twisting tail without apparent wound diverts enemy’s attention and deceives it into thinking it to be some other creature! Meanwhile tailless gecko escapes. However, without tail it can neither move speedily nor climb up a tree easily. It may find balancing the body difficult until a fresh tail grows.

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