An endangered Hermon Mountain viper (Vipera bornmuelleri) at the St. Louis Zoo.
Armenian viper (Montivipera raddei) at the St. Louis Zoo.
Ocellate mountain viper (Montivipera wagneri) at the St. Louis Zoo.
Anatolian viper (Vipera albizona) at the St. Louis Zoo.
An endangered Caucasus viper (Vipera kaznakovi) at the St. Louis Zoo.
Bolkar viper (Montivipera bulgardaghica) at the St. Louis Zoo.
A Fea’s viper (Azemiops feae) at the St. Louis Zoo.
A Tokaren pit viper (Trimerasurus tokarensis) at the St. Louis Zoo.
A Rowley’s palm pit viper (Bothriechis rowleyi) at the St. Louis Zoo.
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