Anaxyrus cognatus

Anaxyrus cognatus: The Great Plains Toad

The Great Plains toad, scientifically known as Anaxyrus cognatus, is a prominent amphibian species native to the central regions of North America. Its range extends across the Canadian Prairies, encompassing southern Alberta, Manitoba, and Saskatchewan, and continues south into northern Mexico, including the Sonoran Desert and Mexican Plateau. This species is recognized for its substantial size relative to many other toads and its distinctive coloration, which typically features a blend of grey, brown, and green with darker blotches.

Habitat and Ecology

Anaxyrus cognatus is well-adapted to arid and semi-arid environments, preferring grassland habitats characterized by loose soil that allows for easy burrowing. They are also found in deserts, semi-desert shrublands, open floodplains, and agricultural areas. When not active, these toads spend their time underground. Their diet primarily consists of insects, with a notable consumption of cutworms, as well as other invertebrates like lepidopterans, dipterans, hymenopterans, coleopterans, ants, and termites. The plains garter snake (Thamnophis radix) is among its known predators, and the toad possesses chemoreceptors to detect the chemical cues left by these snakes.

Reproduction and Behavior

Breeding activities for the Great Plains toad occur during the spring and summer months, often triggered by significant rainfall. They utilize temporary water bodies, such as rain pools, flooded areas, and ponds, for reproduction. The eggs and larvae develop in these shallow aquatic environments, with metamorphosis typically taking between 17 and 45 days. In drier regions, the toad may only emerge from its burrow for brief periods when conditions are favorable, often at night. Conversely, in areas with consistent water availability and abundant rain, they can be active throughout the day. A notable characteristic is their loud, harsh, and rapidly repeated chirping mating call.

Conservation

Despite its extensive distribution, the Great Plains toad is not currently considered a threatened species. However, populations can face challenges from human activities, including road kills, agricultural practices, the expansion of suburban areas, increased drought conditions, and general urbanization, which can lead to habitat degradation and fragmentation.