Threatened arthropods United States, and IUCN Red List for international purposes. Only a tiny fraction of the planet's endangered arthropods are formally recognized as such, as no one has ever evaluated the conservation status of the vast majority of arthropod species. It is difficult to estimate the total number of endangered arthropod species, since many of the taxa themselves have not been recorded. For example, in North America the estimated number of insect species exceeds 163,000, of which only about two thirds are taxonomically known. An even greater discovery awaiting, over 72 percent of North American arachnids are yet to be named
Animals Are Like That describes the animals in their native haunts, the capture of some of them, their characteristics, and their reactions in captivity...filled with adventure and odd bits of animal lore." Booklist 36:170 Jan 1, 1940<br> "The vast legion of Frank Buck's followers will find "Animals Are Like That" thoroughly enjoyable and instructive reading. When the author doesn't know the answer to some more intangible animal trait he frankly admits his deficiency; but this happens infrequently. Mr. Buck has selected a large number of excellent illustrations..." Springfield Republican p10 Nov 29, 1939<br> "A fascinating study of animal traits." The Montreal Gazette - Dec