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Overexploiting sea otters resulted in cascade effects which destroyed kelp forest ecosystems. Overexploitation of species can result in knock-on or cascade effects. This can particularly apply if, through overexploitation, a habitat loses its apex predator. Because of the loss of the top predator, a dramatic increase in their prey species can ...
Thayer's 1902 patent application. He failed to convince the US Navy. The English zoologist Edward Bagnall Poulton, author of The Colours of Animals (1890) discovered the countershading of various insects, including the pupa or chrysalis of the purple emperor butterfly, Apatura iris, [2] the caterpillar larvae of the brimstone moth, Opisthograptis luteolata [a] and of the peppered moth, Biston ...
It is threatened by overhunting and the destruction of its natural habitat. It is not a common species naturally, and the population appears to have been reduced considerably. Takin horns have appeared in the illegal wildlife trade in Myanmar ; and during three surveys carried out from 1999 to 2006 in the Tachilek market, a total of 89 sets of ...
Compared to terrestrial kangaroos, tree-kangaroos have longer and broader hind feet with longer, curved nails. They also have a sponge-like grip on their paws and soles of their feet. Tree-kangaroos have a much larger and more pendulous tail than terrestrial kangaroos, giving them enhanced balance while moving about the trees.
The African bush elephant (foreground), Earth's largest extant land animal, and the Masai ostrich (background), one of Earth's largest extant birds. In zoology, megafauna (from Greek μέγας megas "large" and Neo-Latin fauna "animal life") are large animals. The precise definition of the term varies widely, though a common threshold is ...
Circles, Xs, and dots in various colors identify which trees are to be cut, which ones are hazards, and which ones should be left alone. They also mark property boundaries and environmental concerns.
Poaching continued, leading the government to declare the Japanese serow a "Special Natural Monument" in 1955, [k] [10] at which point overhunting had brought its numbers to 2000–3000. [19] Populations grew as the police put an end to poaching, and post-War monoculture conifer plantations created favourable environments for the animal.
The main drivers of the species' extinction were habitat destruction and overhunting. On top of anthropogenic activities, the deforestation that put passenger pigeons at risk was also catalyzed by the invasive chestnut blight, which greatly reduced the number of American chestnut trees in North America. [25]