Winds could occasionally gust over 40 mph.. The prominent grizzly family was pointed north, and everyone's hunch was that they were headed into the den. JACKSON, Wyo. Gillette, WY (82718) Today. I studied prairie rattlesnakes in Wyoming, where one den contained over 600 individuals! Windy this evening. Late spring is typically when the Western rattlesnake, the only venomous snake in Idaho, starts emerging from its den in search for food. Although you shouldn't let the prospect of coming across a rattlesnake deter you from future adventures, it's definitely important to know what to do if you do come across one. Low 27F. (AP) - Kelly Wasenmiller was captivated from afar, tempted by photos and videos that piled up online of grizzly bear 399 and her four lined-out cubs trudging through the snow. A Wyoming grizzly bear and her cubs continue to be a major draw for wildlife watchers, right up to when they den for the winter. A Wyoming grizzly bear and her cubs continue to be a major draw for wildlife watchers, right up to when they den for the winter. In colder northern climates, rattlesnakes can form huge denning aggregations. Clear. In really cold climates, the ground can freeze up to 4 to 6 feet deep, and the reason there were so many snakes in one spot is probably because suitable dens sites are limited. Rattlesnake roundups are major events out west, where the western diamondback rattlesnake is much more common. JACKSON, Wyo. In really cold climates, the ground can freeze up to 4 to 6 feet deep, and the reason there were so many snakes in one spot is probably because suitable dens sites are limited. I studied prairie rattlesnakes in Wyoming, where one den contained over 600 individuals! I studied prairie rattlesnakes in Wyoming, where one den contained over 600 individuals! faded rattlesnakes in Wyoming, where the subspecies reaches its northern limits (Parker 2003). Their return initiates in September and they remain close to the den area during the final autumn months where they feed and bask as weather permits. Prairie rattlesnakes in Wyoming may leave the hibernaculum area from late April through mid-June depending upon the weather conditions. Those hunters often use gasoline fumes to drive the snakes from their den, and once they're caught, the reptiles become snacks or boots, or are stuffed in a striking position, fangs forever bared. In colder northern climates, rattlesnakes can form huge denning aggregations. (AP) - Kelly Wasenmiller was captivated from afar, tempted by photos and videos that piled up online of grizzly bear 399 and her four lined-out cubs trudging through the snow. Less conspicuous than the pronghorn antelope and the golden eagle is an even more ancient inhabitant of the high plains and valleys of Wyoming, the prairie rattlesnake. A prairie rattlesnake samples the air with its forked tongue. 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