Clasificación de la Biblioteca del CongresoQL671-699

Africa(322) animal behavior(264) animals(8,572) Antarctic(144) art(947) behavior(405) biology(3,665) bird(1,161) birds(41,557) Britain(343) California(212) Canada(223) children(464) children's(786) conservation(457) ducks(505) Eastern United States(56) ecology(655) endangered species(200) environment(417) Europe(420) evolution(516) extinction(182) falconry(229) finches(63) garden(167) gardening(566) guide(1,126) guidebook(555) Hawaii(195) informational(571) juvenile(270) juvenile literature(127) juvenile non-fiction(146) life cycle(233) life science(377) Life Sciences(156) migration(495) natural science(465) natural world(129) naturalist(56) nature(11,372) nature writing(179) North America(1,542) outdoors(323) owls(1,514) penguins(2,423) photographs(322) photography(545) picture book(1,570) polar(114) ravens(212) reference(4,475) science(8,685) science nonfiction(112) South America(192) species(165) spring(182) Texas(252) travel(586) usa(384) vultures(90) wildlife(1,600) winter(437) world(193)