How many animal species are kept in captivity in the world ? I would guess about 10000. What do you think ? I base this on these figures: Mammals: I dont know how many mammal species are kept in captivity but I will guess about 700 to 1000 Birds: I have read somewhere that about 2500 of the worlds 9000 bird species are kept in captvity Reptiles: Dont know, from 500-1000 Amphibians: Maybe 500 Fish: Very many species of fish are kept. 1500 species are kept by the home aquarium industry alone, So I will guess that 2000-3000 species of fish are kept in captivity Invertebrates: I dont know here either but it is between 500 and 1000 I think. Many of these numbers are only qualifed guesses and estimates, so contribute with your own numbers if you know anything about this. It is highly interesting with all the species in the modern Noahs Ark. Also interesting with animal species that is not in capitvity. Write comments if you know anything more about this.