4 Species That Barely Survived

It's a wide known fact that the Earth is losing species on daily basis. The worst estimates range up to 137 species a day. The reasons are various, from clearing woods and building dams and thus shrinking habitat of wildlife, to pollution which is becoming major concern. Here, you'll read about species that were almost lost because of unscrupulous exploitation of nature.

Bald eagle, one of the most famous symbols of America, almost died out back in the 50's. Its numbers were reduced to mere 419 mating pairs in lower 48 States. Reason for this was pesticide known as DDT. It circulated through food chain, and when it got to its predatorial top, it made eagle's egg shells so thin that it couldn't do proper job of protecting the embryo. When the problem was identified and dealt with, number of eagles soared so high that National Fish and Wildlife Service stopped doing yearly counts.

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