By Anthony P. Russell, Aaron M. Bauer
Amphibians & reptiles (herpetofauna) are an important yet a lot overlooked part of the normal economic system of the province of Alberta. This moment variation, which keeps either as a box consultant & a entire normal background, builds at the strengths of the 1st, with a richly illustrated textual content, & color images of the species taken by means of popular flora and fauna photographer, Dr Wayne Lynch. The award-winning first variation obtained attractiveness within the Emerald Awards for Environmental Excellence. This moment version has been completely revised & up to date. Nomenclature has been replaced to mirror present pondering within the box. New images were extra, & maps & illustrations were up-to-date.
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Extra info for Amphibians and Reptiles of Alberta: A Field Guide and Primer of Boreal Herpetology
1984; Bider and Matte 1990; Chabot and St. R. R. R. 1984; Weller and Green 1997 Stebbins 1985; Reichel and Flath, 1995 Montana is also included for comparison as it lies adjacent to Alberta. There is the possibility of four other species occurring in Alberta (see Chapter 5). R. 1984; Alberta Fish and Wildlife 1985). 32 AMPHIBIANS AND REPTILES OF ALBERTA venom injection mechanism among snakes. Large, hollow, moveable fangs are located at the front of the upper jaw. In biting, they are swung forward from their folded resting position, and the victim is stabbed and poisoned in a rapid thrust.
All crocodylians are large, with several species exceeding six metres in total length. Only two crocodylians are native to North America. Crocodylus acutus is found in southern Florida and Alligator mississippiensis is widespread in the southeastern United States. Like turtles, crocodylians are hunted, primarily for their skins which are used in the manufacture of leather goods. This activity was responsible for a great decline in alligator populations earlier in the century, but with government protection alligators have returned to many areas of their former range.
5) Dorsal scales smooth Four prefrental scales (Fig. 5) Two prefrontal scales (Fig. 5 20A. Lateral stripes on 3rd and 4th rows of dorsal scales Thamnophis radix B. Lateral stripes on 2nd and 3rd rows of dorsal scales 21 21A. Eight upper labial scales (Fig. 6), both pairs of chin shields approximately equal in size Thamnophis elegans B. Seven upper labials (Fig. 6 43 44 AMPHIBIANS AND REPTILES OF ALBERTA Key to the Larval Amphibians of Alberta (Late Stages) Go to 1A. Body elongate, both front and hind limbs present, conspicuous external gills (Fig.