Endangered species 57 Wildlife conservation 18 Nature conservation 6 Juvenile literature 5 Smuggling 4 Biodiversity 3 Penguins 3 Wild animal trade 3 Animals 2 Aquatic biodiversity conservation 2 Aquatic ecology 2 Atlases 2 Bears 2 Brennan, temperance (Fictitious character) 2 Brothers 2 Dogs 2 Endangered Species 2 Endangered ecosystems 2 Endangered plants 2 Fiction 2 First grade (Education) 2 Giant panda 2 Human-animal relationships 2 Jungle animals 2 Magic 2 Manatees 2 Mystery and detective stories 2 Pandas 2 Rain forest animals 2 Schools 2