20thcentury activities activitybooks adventure adventurers advocates africa africanamerican africanamericanpoetry africanamericans agriculturalinsecticides agriculture ancientcultures animalbehavior animalecology animalhusbandry animalrights animals apes applied aquaculture archaeology arizona- arthropods asianpeople asianphilosophy basicconcepts behavioralpsychology beliefs biggame biodiversity biology birds birdsofprey britishauthors cacti/succulents caretaking caribbean cats child children'sclassics christian christianity cognitivescience criticism cultures curiosities dance descriptions developmentaldisorders disease dogbreeds dogs dolls earlyreaders ecology ecosystems education emotions entertainment entomology environmentalconservation ethics etiquette europeanpeople evolution fables fairytales familylife fantasy favoritecharacters feelings festivals fiction fieldguides fingerplays fisheries folklore food forest fri friendship games general gettingalong girls greatbasinindians habitats habitatsinenvironmentalscience health herbicides heroes hiking historicalfiction historicalpeople history holidays homecleaning hunting insects islandpeoples kinship landscape largeherbivores literarybiography literarystyles literature magic maintenance mammals manners marine marinebiology marinelife medicine metabolism miscellaneous miscellaneousholidays miscellaneousnativeamericans miscellaneouspeople miscellaneousphotography monkeys monsters moralphilosophy motivation movements movie/tvtie-in nativeamericanpeoples nativeamericans nativenorthamericanpeoples naturalhistory nature newyorkcity nurseryrhymes occupations pathology peoplewithspecialneeds petbirds petmemoirs pets pharmacology philosophy photoessays physicalanthropology physiology places plantecology plants poetry professionals protectionofplants psychologicalself-help psychology puppets qualities recreation reference regional rehabilitation religion reproductivesystem reptiles rescue research rhymes romance ruralsociology school schools sciencefiction scientificresearch self-improvement socialissues socialsciences specialneeds sports studyaids success teenfiction terrorism thearts thrillers toys training transportation travel unitedstates urbanecology urbanization values vertebrates veterinarymedicine walking wildlife wildlifephotography wildlifeviewing wonders workingdogs youngwomen zoology