Mexican lance-headed rattlesnake (Crotalus polystictus) at the St. Louis Zoo.
An Arizona ridge-nosed rattlesnake (Crotalus willardi willardi) at the St. Louis Zoo.
A black widow spider (Latrodectus mactans) at Reptile Gardens.
An Osage copperhead (Agkistrodon contortrix phaeogaster) at Reptile Gardens.
A broad-banded copperhead (Agkistrodon contortrix laticinctus) at Reptile Gardens.
A Grand Canyon rattlesnake (Crotalus viridis abyssus) at Reptile Gardens.
A king cobra (Ophiophagus hannah) at Reptile Gardens.
A Hopi rattlesnake (Crotalus viridis nuntius) at Reptile Gardens.
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