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The Colorado River toad can grow to about 190 millimetres (7.5 in) long and is the largest toad in the United States apart from the non-native cane toad (Rhinella marina). It has a smooth, leathery skin and is olive green or mottled brown in color. Just behind the large golden eye with horizontal pupil is a bulging kidney-shaped parotoid gland.
The cane toad is estimated to have a critical thermal maximum of 40–42 °C (104–108 °F) and a minimum of around 10–15 °C (50–59 °F). [43] The ranges can change due to adaptation to the local environment. [44] Cane toads from some populations can adjust their thermal tolerance within a few hours of encountering low temperatures. [45]
The geographic range of cane toads completely overlaps the geographic range of Mitchell's water monitor. [8] Not all cane toads are entirely lethal as the smaller ones have non-lethal doses of poison compared to the larger toads; despite this, Mitchell's water monitor and other monitors will go after the larger toads that contain lethal doses.
Cane toads are reddish-brown to grayish-brown with a light-yellow or beige belly, according to the Florida Fish and Wildlife Conservation Commission. They can be uniform in color or have darker ...
Rhinella, commonly known as South American toads, beaked toads or Rio Viejo toads, is a genus of true toads native to Neotropical parts of Mexico, Central and South America. Additionally, the cane toad has been Introduced to Australia, the Caribbean, the Philippines and elsewhere.
The eastern American toad (A. a. americanus) is a medium-sized toad usually ranging in size from 5–9 cm (2.0–3.5 in); [13] the record length for an eastern American toad is 11.1 cm (4.4 in). [14] The color and pattern is somewhat variable, especially for the females.
It is one of three rather similar species sometimes referred to as "cururu toads" in Brazil, the others being R. jimi and R. marina (cane toad). Like those, R. diptycha is a large toad, females up to 25 cm (9.8 in) in snout–to–vent length and males up to 18 cm (7.1 in).
It appears they can be taught to avoid cane toads if exposed to toads that are too young to be lethal if ingested. In experimental areas where 200,000 total cane toad eggs, tadpoles, and metamorphs were introduced ahead of an inevitable invasion front, substantial populations of monitors persisted following invasion by wild toads.