Zoology 575 Entomology 531 Parasitology 290 Insects (Entomology) 247 Animal behaviour patterns 242 Insects 176 Fishes 168 Vertebrates-- Cold-blooded vertebrates-- Pisces (Fishes)-- Cat fishes 133 Birds 126 Invertebrates 86 Nematology 75 Ornithology 65 Physiology 63 Mammals 59 Evolution 58 Ecology 57 Pests 57 Nematodes 52 Animals-- Zoology 51 Animals 46 Invertebrates-- Zoology 44 Animal ecology-- Animals of specific environments 43 Vertebrates 43 Natural history of animals 40 Dissertations, Academic (Ph.D) 39 Freshwater fishes 38 Genetics 35 Mammalia (Mammals) 35 Animal taxonomy-- Zoology 34 India 34