Sentences with phrase «animal populations crashed»

Not exact matches

One plausible explanation was that over the course of successive population crashes, the devils had become so inbred that their cells look identical — at least to the animals» immune systems.

A World Wildlife Fund report estimates losses of 40 percent of all individual land and sea animals, and a 70 percent population crash of all river animals, since 1970.

Mercury pollution in marine animals might be behind a population crash of foxes on a Russian island

There may have been a very dramatic population crash when this disease swept through, but some animals were hanging on.

Ecology 101 — all animal populations, if given ample food and a lack of predators, will multiply until there is some kind of population crash.