John Cancalosi / Timber rattlesnakes emerging from den {Crotalus horridus} Pennsylvania, USA
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John Cancalosi / Timber rattlesnake (Crotalus horridus) females coiled up in leaf litter, newborn young sheltering under rock. At maternity site, Pennsylvania, USA. August.
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John Cancalosi / Timber rattlesnake (Crotalus horridus) females in undergrowth at maternity site, Pennsylvania, USA. August.
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John Cancalosi / Timber rattlesnake (Crotalus horridus) females and newborn young at maternity site. Pennsylvania, USA. August.
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John Cancalosi / Timber rattlesnakes (Crotalus horridus), gravid females basking to bring young to term, Pennsylvania
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Paul Williams / Timber rattlesnake (Crotalus horridus) with babies aged two days. Rhode Island, USA. Photographed as part of a captive breeding and release programme, Roger Williams Park Zoo.
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Paul Williams / Timber rattlesnake (Crotalus horridus) female close up of scales, Rhode Island, USA. Part of captive breeding and release programme, Roger Williams Park Zoo.
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Paul Williams / Timber rattlesnake (Crotalus horridus) with babies aged two days, part of a captive breeding and release programme, Roger Williams Park Zoo.
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Paul Williams / Timber rattlesnake (Crotalus horridus) with babies aged two days, part of a captive breeding and release programme, Roger Williams Park Zoo.