Classificação da Biblioteca do Congresso dos E.U.A. (LCC)QL956.B35

anatomy(16) animals(228) babies(9) beautiful(5) biology(190) bird(5) birds(182) bugs(7) butterflies(5) chicks(6) children(14) children's(29) children's literature(6) children's picture book(5) development(49) ducks(10) Easter(15) egg(51) elementary(5) environment(11) evolution(21) farm(13) fish(12) genetics(12) Grade 2(5) growing(7) history(6) history of science(13) informational(53) informative(7) insects(26) juvenile(8) juvenile literature(6) juvenile non-fiction(8) life cycle(75) life science(23) literary nonfiction(11) mammals(7) medical(6) medicine(11) metamorphosis(12) nature(126) penguins(6) photographs(11) physiology(5) picture book(147) poetry(7) preschool(10) primary(7) reference(15) reproduction(12) reptiles(29) research(5) science(327) science nonfiction(11) snakes(9) spring(51) turtles(10)