Tony Phelps / Cape cobra (Naja nivea) spreading its hood, retreats into hole, De Hoop Nature Reserve, Western Cape, South Africa, January.
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Tony Phelps / Cape cobra (Naja nivea) emerging from a Cape gerbil (Gerbilliscus afra) burrow, hunting and smelling with its tongue, De Hoop Nature Reserve, Western Cape, South Africa, January.
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Tony Phelps / Cape cobra (Naja nivea) hunting, chasing a Cape gerbil (Gerbilliscus afra), De Hoop Nature Reserve, Western Cape, South Africa, December.
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Silke Arndt / Western rattlesnake (Crotalus viridis viridis), threat display, South Dakota, USA, September.
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John Cancalosi / Western diamondback rattlesnake (Crotalus atrox), defensive rattling, Arizona, USA, April.
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John Cancalosi / Group of gravid female Timber rattlesnakes (Crotalus horridus) basking before giving birth, Pennsylvania, USA, July.