The southern toad is the biggest toad in the southeastern United States, growing to a maximum length of about 92 mm. It is a medium-sized, plump amphibian whose snout-to-vent measurement can reach that size, with females a little larger than the males. This length makes it noticeably larger than any other toad sharing its coastal-plain range. Its overall body size is roughly 8 cm, confirming its status as the region's largest toad.
A key field mark of the southern toad is the pair of knobs on its head and the backward-pointing spurs that run to the parotoid glands. These spurs are visible as extensions that reach as far as the toxin-producing glands on the back of the neck. The knobs and spurs give the toad a distinctive, rugged appearance that helps separate it from other regional amphibians. Their presence is noted in the species description as the most obvious distinguishing features.
Each breeding female deposits a large clutch of eggs, ranging from 1,704 up to 16,537, in shallow water bodies during the spring months. The eggs are laid in temporary or permanent pools, ditches, swamps and lake margins after heavy rain triggers massive male choruses. This prolific reproductive output ensures many tadpoles can develop, even though they later face variable survival rates.
Southern toad tadpoles grow quickly, needing only thirty to fifty-five days in the water before they transform into tiny juveniles about one centimetre long. During this period they scrape algae from submerged vegetation, favouring open, warm waters where higher temperatures speed growth. Once metamorphosis is complete the young toads leave the pond and begin a terrestrial life stage.
When threatened, the southern toad secretes a potent bufotoxin from its parotoid glands, a chemical defence that deters predators such as hog-nosed snakes which feed heavily on adults. The toxin is stored in the enlarged glands behind the head and is released when the toad is handled or attacked. This defence allows the toad to survive encounters with otherwise lethal predators, contributing to its stable populations across its range.
Sources
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In the warm, humid nights of the southeastern United States, the Southern Toad emerges from its underground hiding places, its warty skin glistening with dew as it begins its deliberate, hopping journey through the forest floor. With a gentle, almost apologetic air, it moves through the underbrush, its golden eyes blinking slowly as it searches for unsuspecting insects to snatch up with its sticky tongue. As it navigates this shadowy world, the Southern Toad's very existence is a testament to the enduring power of adaptation, its rugged, unassuming beauty a reminder of the beauty that can be found in even the most overlooked of creatures.
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