Download PDF by Anthony P. Russell, Aaron M. Bauer: Amphibians and Reptiles of Alberta: A Field Guide and Primer

By Anthony P. Russell, Aaron M. Bauer

ISBN-10: 1552380386

ISBN-13: 9781552380383

Amphibians & reptiles (herpetofauna) are an important yet a lot ignored element of the traditional financial system of the province of Alberta. This moment version, which keeps either as a box advisor & a complete common historical past, builds at the strengths of the 1st, with a richly illustrated textual content, & color photos of the species taken by way of popular flora and fauna photographer, Dr Wayne Lynch. The award-winning first version bought 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 additional, & maps & illustrations were up-to-date.

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Additional resources for Amphibians and Reptiles of Alberta: A Field Guide and Primer of Boreal Herpetology

Example text

In size, they range from geckos (Family Gekkonidae) less than forty millimetres in total length to Komodo dragons (Varanus komodoensis, Family Varanidae) occasionally reaching three metres in length. Fossil varanids were even larger, and the closely related aquatic mosasaurs were the largest lizards ever to have existed, reaching lengths of more than ten metres. Most lizards are insectivorous, but some larger species are carnivorous and others are largely or entirely herbivorous. The beaded lizards (Family Helodermatidae) employ venom in subduing prey and are the only lizards to do so.

In biting, they are swung forward from their folded resting position, and the victim is stabbed and poisoned in a rapid thrust. The crotalids are known as pit vipers because they bear pits in the facial region that act as temperature sensitive structures, by means of which they can sense the location of their prey by detecting infra-red radiation. Significant references: Alberta Recreation and Parks 1986; Anon 1964a, b, 1971, 1972; Beck and Beck 1988; Black 1967,1969,1970a, b, 1971; Black and Brunson 1971; Blair 1963, 1972; Boulenger 1920; Bow Valley Naturalists 1978; Breitenback et al.

The tongue of snakes is highly protrusible and is frequently flicked out as the snake explores its environment. This tongue flicking is important in picking up chemical signals that are transferred to the paired pockets of Jacobson's organ in the roof of the mouth. Some snakes, including the pit vipers (Family Viperidae) and most boids and pythons also have a sensory system for detecting infrared heat. This is accomplished by way of pits on the side of the face or lips and enables these snakes to detect prey items by the heat they radiate, even in total darkness.

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Amphibians and Reptiles of Alberta: A Field Guide and Primer of Boreal Herpetology by Anthony P. Russell, Aaron M. Bauer

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