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Soon after opening the Serpentarium Haast began experimenting with building up an acquired immunity to the venom of King, Indian and Cape cobras by injecting himself with gradually increasing quantities of venom he had extracted from his snakes, a practice called mithridatism.
The sanctuary is home to over 26 species of reptiles belonging 11 families, of which 6 species are endangered, namely, Indian cobra, Russel’s viper, Indian Rock python, Indian rat snake, Chequered Keelback and Monitor lizard.