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The dwarf American toad (A. a. charlesmithi), is a smaller version of the American toad, which reaches lengths of about 6 cm (2 + 1 ⁄ 4 in), is generally a dark reddish color ranging to light red in some specimens in isolated populations. The spots on the back are reduced or absent, and when present they contain a few small red warts and a ...
Southern spadefoot toad, Florida-adult. The Scaphiopodidae are a family of American spadefoot toads, which are native to North America. The family is small, comprising only eleven different species. The American spadefoot toads are of typical shape to most fossorial (or burrowing) frogs. They are round, with short legs and protruding eyes.
Toad is a common name for certain frogs, especially of the family Bufonidae, that are characterized by dry, leathery skin, short legs, and large bumps covering the parotoid glands. [ 1 ] [ 2 ] In popular culture ( folk taxonomy ), toads are distinguished from frogs by their drier, rougher skin and association with more terrestrial habitats. [ 3 ]
Anaxyrus, containing the North American toads, is a genus of true toads in the family Bufonidae. [1] The genus is endemic to North and Central America , and contains many familiar North American toad species such as the American toad , Woodhouse's toad , and the western toad .
Thirdly, it is a phenotypic trait or adaptive trait, with a functional role in each individual organism, that is maintained and has evolved through natural selection. Historically, adaptation has been described from the time of the ancient Greek philosophers such as Empedocles and Aristotle .
Adaptive traits are those that produce more copies of the individual's genes in future generations. Maladaptive traits are those that leave fewer. For example, if a bird that can call more loudly attracts more mates, then a loud call is an adaptive trait for that species because a louder bird mates more frequently than less loud birds—thus ...
Australian park rangers believe they have stumbled upon a record-breaking giant toad deep in a rainforest. Dubbed "Toadzilla", the cane toad, an invasive species that poses a threat to Australia's ...
It attempts to frame the existence and persistence of traits, assuming that each of them arose independently and improved the reproductive success of the organism's ancestors. A trait is an adaptation if it fulfils the following criteria: The trait is a variation of an earlier form. The trait is heritable through the transmission of genes.