Cane Toad Facts

Adults usually run 4 to 6 inches, the largest near 9 inches and up to 2.6 pounds, with females bigger than males. The skin is thick, dry, and warty, olive- to gray-brown with darker mottling. Behind each eye sits a large parotoid gland that oozes a milky bufotoxin when the toad is squeezed or bitten; the poison hits the heart and nervous system of anything that swallows it, and it is present at every stage — eggs, tadpoles, and adults alike. Toothless, the cane toad simply engulfs prey whole. It belongs to the true-toad family Bufonidae, and its toxin evolved in the Neotropics alongside predators that could tolerate or avoid it — which is exactly why it proves so lethal to naive predators elsewhere.

In its native range the cane toad occupies forest edges, savanna, and riverbanks from the southern U.S. border through Mexico and Central America into South America, and it readily colonizes gardens, farmland, and roadside ditches wherever there is moisture and shelter. The more arboreal red-eyed tree frog shares part of this region but clings to humid vegetation near breeding water. Introduced populations now cover much of northern and eastern Australia, several Pacific islands, the Caribbean, and southern Florida — spread largely through deliberate releases for pest control and accidental transport in cargo.

Cane toads are opportunistic carnivores that eat almost anything they can swallow — insects, small rodents, small reptiles, other amphibians, and carrion — and around settlements they happily take pet food left outdoors and insects drawn to lights. They forage mostly at night, sitting near a light or open patch and lunging with a wide mouth. That indiscriminate appetite and broad tolerance are major reasons they establish so easily in new places.

Outside breeding gatherings the cane toad is largely solitary, sheltering by day in burrows, leaf litter, or under debris and emerging at dusk to hunt. Threatened, it inflates its body, tilts its head down, and turns its parotoid glands toward the attacker; handling or biting triggers the toxin. In Australia this defense has killed dogs, cats, and native predators with no tolerance for bufotoxin.

Breeding follows warm, wet conditions, often after seasonal rain. A single female can lay 8,000 to 25,000 eggs in strings wound around submerged plants or debris, and they hatch into tiny black tadpoles within 48 to 72 hours. Tadpoles take several weeks to metamorphose, and both eggs and tadpoles carry bufotoxin, which spares them from many fish and aquatic predators. Cane toads mature within about a year and live roughly 5 years in the wild, sometimes 10 to 15 in captivity.

The cane toad is Least Concern with an increasing trend — a status that reflects both stable native numbers and relentless expansion abroad. At home in Central and South America it faces no major threats and stays common. The real concern runs the other way: in Australia and other introduced regions it harms native wildlife through predation, competition, and poisoning, driving control and research aimed at slowing its spread rather than protecting the toad itself.

• IUCN Red List of Threatened Species: Rhinella marina
• Australian Museum: Cane Toad
• National Geographic: Cane Toad
• AmphibiaWeb: Rhinella marina