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A tadpole or polliwog (also spelled pollywog) is the larval stage in the biological life cycle of an amphibian. Most tadpoles are fully aquatic, though some species of amphibians have tadpoles that are terrestrial. Tadpoles have some fish-like features that may not be found in adult amphibians, such as a lateral line, gills and swimming tails.
Tadpoles rapidly mature into toads and must bury themselves before desert conditions revert to normal. The species of spadefoot toads are found in different locations across North America. The eastern spadefoot is the only species found east of the Mississippi River, ranging from New England to southern Florida.
The American toad (Anaxyrus americanus) [3] is a common species of toad found throughout Canada and the eastern United States.It is divided into three subspecies: the eastern American toad (A. a. americanus), the dwarf American toad (A. a. charlesmithi) and the rare Hudson Bay toad (A. a. copei).
“A near threatened species due to habitat destruction and predators, these tadpoles start their transition into toads between four and twelve weeks after hatching, but an estimated 99% of them ...
The western toad (Anaxyrus boreas) is a large toad species, between 5.6 and 13 cm (2.2 and 5.1 in) long, native to western North America. [1] [3] [4] A. boreas is frequently encountered during the wet season on roads, or near water at other times.
The female Houston toad can grow to be 52–88 millimetres (2.0–3.5 in) (snout to vent) when mature and are typically larger and bulkier than males. Male toads are commonly 45–70 millimetres (1.8–2.8 in) long. [9] Although generally brown and speckled, their color can range from black to purplish gray, sometimes with green patches.
Ants and beetles are their most common prey. Feeding seems to be generalized and opportunistic; the toads will eat anything they can subdue. [4] Adults hunt in spring and summer, but only at night or during light rains. Spadefoot tadpoles are dimorphic. Within a cohort, some tadpoles have large mouthparts, while others have much smaller mouthparts.
The tadpoles at first look similar to those of the common frog (Rana temporaria) but they are a darker colour, being blackish above and dark grey below. They can be distinguished from the tadpoles of other species by the fact that the mouth is the same width as the space between the eyes, and this is twice as large as the distance between the ...