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general characters classification climatic conditions fauna geographical area general characters and classification introduction structure birds aves echinodermata mollusca types of skulls reptiles migration amphibia pisces fishes mammals dentition identification of poisonous snakes reptiles characters effects thomsons explanation coiling &torsion definition torsion uses of vermicompost vermiwash vermicompost vermiculture functions types antibodies tardigrada crustaceans insecta arthropoda abdominal appendages thoracic appendages cephalic appendages appendages prawn nonchordates affinities belanoglossus hemichordata nemathelminthes nematoda protozoa annelida buffalo breeds exotic breeds indigenous breeds cattle breeds breeds principles of poultry housing intensive semi intensive cage system deep litter system ethiopian region australian region oriental region immunology