American Toad (Anaxyrus americanus)
Order Anura; Family Bufonidae; Genus Anaxyrus. Distinguished by dry, warty skin, parotoid glands behind the eyes, and a horizontal pupil.
Species
American Toad (Anaxyrus americanus)
Family
Order Anura; Family Bufonidae; Genus Anaxyrus. Distinguished by dry, warty skin, parotoid glands behind the eyes, and a horizontal pupil.
Size
Adult SVL typically ranges from 5 to 11 cm (2 to 4.5 inches). Females are generally larger than males. Weight varies by season and hydration, usually between 20-50 grams.
Conservation
IUCN Status: Least Concern. Population is stable. Threats include habitat loss, pesticide runoff, and road mortality during migration.
Description
A classic backyard visitor, the American Toad is a master of camouflage against leaf litter and soil. Its warty skin and calm demeanor make it one of the most recognizable amphibians in North America, often seen under porch lights hunting insects.
Key Features
Look for the dry, warty skin, large oval parotoid glands, and the specific count of 1-2 warts within each dark spot on the back.
Physical Description
A robust, squat toad with short limbs. The head is broad with prominent cranial crests. Large, oval-shaped parotoid glands are present behind the eyes. It has no teeth and horizontal pupils.
Skin Texture & Coloration
The skin is highly granular and covered in numerous large warts. Coloration is highly variable, ranging from tan and brown to olive or brick red. There are often dark spots on the back, and the underside is light with dark speckles. Some individuals have a light mid-dorsal stripe.
Distinguishing Features
Key diagnostic: only 1 or 2 warts per dark dorsal spot. The parotoid glands are either separated from the cranial crests or connected by a short spur. This distinguishes it from the Fowler's Toad.
Habitat
Extremely versatile: found in forests, prairies, gardens, and urban backyards. Requires semi-permanent ponds or shallow pools for breeding. It is primarily terrestrial and fossorial.
Geographic Range
Common throughout eastern North America, from central Canada south to the northern parts of the Gulf States and west to the eastern edge of the Great Plains.
Behavior
Primarily nocturnal, though active on cloudy/rainy days. It uses its powerful forelimbs to burrow into the soil or leaf litter for protection and during temperature extremes. It is a 'hop-and-stop' mover.
Diet & Feeding
An opportunistic carnivore. It eats a wide variety of invertebrates including beetles, snails, slugs, earthworms, and spiders. It uses an 'ambush and snap' strategy with a sticky tongue.
Reproduction
Explosive breeding in spring (March-May). Males use high-pitched trills to attract females to shallow water. Amplexus is axillary. Eggs are laid in long, distinctive double strings of jelly.
Vocalizations
A long, musical, high-pitched trill lasting 6 to 30 seconds. To a human, it sounds like a sustained, vibrating whistle. Each male has a slightly different pitch.
Life Cycle
Eggs hatch in 3-12 days. The tadpole stage takes 40-70 days. Metamorphs are tiny (approx. 1 cm) and emerge in large numbers. Sexual maturity is reached in 2-3 years. Wild lifespan is 1-5 years.
Conservation Status
IUCN Status: Least Concern. Population is stable. Threats include habitat loss, pesticide runoff, and road mortality during migration.
Toxicity & Defense
The parotoid glands secrete bufotoxins when threatened. These can irritate mammalian mucous membranes and are toxic if ingested by pets. Defensive behaviors include inflating the body to appear larger.
Ecological Role
Vital pest controllers that consume vast quantities of garden and forest insects. They serve as a primary food source for hognose snakes and various birds of prey.
Similar Species
Fowler's Toad (Anaxyrus fowleri) has 3+ warts per spot. Southern Toad (Anaxyrus terrestris) has higher, more prominent cranial crests.
Observation Tips
Best found on warm, rainy spring nights or near porch lights in summer. Look for them on the edges of lawns and forest paths at dusk.
Handling & Safety
Safe for humans to touch, but hands should be washed immediately after. Avoid touching eyes or mouth after handling. The toxins are harmful to dogs/cats if they try to eat the toad.
Seasonal Activity
Active from early spring to late autumn. They hibernate (brumate) during winter by digging deep into the soil below the frost line.
Cultural Significance
Commonly featured in children's literature (e.g., 'Frog and Toad'). Historically associated with garden health and folklore regarding witches, though the 'warts cause warts' myth is false.
Interesting Facts
A single female can lay up to 20,000 eggs. They are known to have 'homing' abilities, often returning to the same breeding pond and burrow site year after year.