Clasificación de la Biblioteca del CongresoQL638.9

abc(429) Africa(1,111) animal behavior(1,366) animal welfare(132) animals(30,200) Antarctic(135) art(699) bears(2,136) behavior(479) big cats(342) biology(5,433) bird(534) birds(17,432) bugs(1,088) butterflies(1,966) cats(853) cetaceans(214) children(1,815) children's(2,798) children's literature(463) conservation(801) coyotes(171) dolphins(613) early reader(547) easy reader(544) ecology(1,100) educational(250) elementary(251) endangered species(481) environment(904) evolution(881) extinction(204) fish(1,055) Grade 2(225) guide(800) guidebook(480) informational(1,993) informative(195) insect(153) insects(3,672) juvenile(819) juvenile literature(231) juvenile non-fiction(439) kids(596) life cycle(975) life science(806) Life Sciences(137) lions(517) mammals(3,188) marine(173) marine life(570) metamorphosis(161) migration(216) moths(314) natural science(444) natural world(166) nature(12,897) North America(1,324) ocean(4,038) oceanography(155) oceans(1,008) outdoors(299) penguins(2,403) photographs(667) photography(851) picture book(4,894) polar bears(836) preschool(265) primary(290) primates(536) rabbits(312) reader(327) reference(4,662) reptiles(844) science(20,689) science nonfiction(274) sea(590) sea life(621) species(91) spiders(365) tiger(165) tigers(583) toads(252) travel(649) turtles(223) whales(1,981) wild animals(437) wildlife(2,168) winter(742) wolf(227) wolves(1,732) youth(326) zoo(772) zoo animals(212)