American Toad (Anaxyrus americanus)
Order Anura, Family Bufonidae, Genus Anaxyrus. This family is characterized by dry, warty skin and prominent parotoid glands behind the eyes which secrete defensive toxins.
Species
American Toad (Anaxyrus americanus)
Family
Order Anura, Family Bufonidae, Genus Anaxyrus. This family is characterized by dry, warty skin and prominent parotoid glands behind the eyes which secrete defensive toxins.
Size
Adult SVL typically ranges from 5 to 11 cm (2 to 4.5 inches). Females are generally larger than males. Metamorphs (toadlets) are tiny, often less than 1 cm upon leaving the water.
Conservation
IUCN Red List: Least Concern. Populations are stable and they are very tolerant of human-altered landscapes, though they remain vulnerable to pesticides and habitat fragmentation.
Description
The quintessential 'garden toad' of North America. Its camouflaged, earthy tones allow it to blend perfectly with mulch and leaf litter. To the naturalist, it represents a vital link between aquatic and terrestrial ecosystems, often seen hopping through gardens on humid summer nights.
Key Features
1-2 warts per dark spot, parotoid glands separated from cranial crests, dry warty skin, and a frequent mid-dorsal light stripe.
Physical Description
Robust, squat body with short limbs. The head features prominent cranial crests. Eyes are large with horizontal pupils. A large, kidney-shaped parotoid gland is visible behind each eye, which is either separated from or connected to the cranial crest by a short spur.
Skin Texture & Coloration
Dry, highly glandular skin covered in warts (tubercles). Coloration is mottled brown, gray, or olive with darker spots. Each dark spot on the back typically contains only one or two large warts. A pale mid-dorsal stripe is often present.
Distinguishing Features
Primary diagnostic marker is having 1-2 warts per dark dorsal spot. The parotoid glands are usually separated from the cranial crests or connected by a very short spur, unlike the Fowler’s Toad which has 3+ warts per spot and glands touching the crests.
Habitat
Highly adaptable, found in forests, grasslands, agricultural fields, and suburban gardens. Requires shallow, semi-permanent or permanent bodies of water for breeding, such as ponds, ditches, or slow-moving streams.
Geographic Range
Common throughout eastern North America, from southeastern Canada south to the Gulf Coast and west to the eastern edge of the Great Plains.
Behavior
Primarily nocturnal and terrestrial. They are adept burrowers, often spending days buried in loose soil or leaf litter. When threatened, they inflate their bodies to appear larger or secrete toxins from parotoid glands.
Diet & Feeding
Generalist carnivore eating a wide variety of invertebrates including beetles, snails, slugs, earthworms, and spiders. They use a 'sit-and-wait' strategy combined with a flicking sticky tongue.
Reproduction
Breeds in spring (March-May). Males aggregate in shallow water and produce high-pitched trills. Females lay eggs in two long, gelatinous strings which can contain up to 20,000 eggs. Amplexus is axillary.
Vocalizations
A long, melodic, high-pitched musical trill lasting 6 to 30 seconds. In a chorus, the overlapping trills create a constant vibrating drone that is unmistakable in spring evenings.
Life Cycle
Eggs hatch in 3-12 days depending on temperature. Tadpoles are small, black, and schooling. Metamorphosis occurs in 40-70 days. Juveniles reach sexual maturity in 2-3 years. Total lifespan can reach 5-10 years in the wild.
Conservation Status
IUCN Red List: Least Concern. Populations are stable and they are very tolerant of human-altered landscapes, though they remain vulnerable to pesticides and habitat fragmentation.
Toxicity & Defense
Possesses parotoid glands that secrete bufotoxins including bufadienolides. These are irritating to mucous membranes and can be dangerous or even lethal to small domestic pets if the toad is swallowed.
Ecological Role
Acts as a major predator of terrestrial invertebrates and serves as a significant food source for hognose snakes, garter snakes, and various birds of prey.
Similar Species
Fowler's Toad (Anaxyrus fowleri): 3 or more warts per spot, parotoid gland touches cranial crest. Southern Toad (Anaxyrus terrestris): Has much higher, knob-like cranial crests.
Observation Tips
Best found on rainy or humid nights following warm spring days. Use a flashlight to scan lawns and forest edges. During breeding season, follow the sound of the trilling chorus to shallow ponds.
Handling & Safety
Safe to handle briefly with wet hands, but wash hands immediately after. Do not touch eyes or mouth after handling due to skin toxins. Handling causes stress to the amphibian; avoid if they appear to be inflating or secreting white fluid.
Seasonal Activity
Active from early spring until the first hard frost. They hibernate underground below the frost line in winter and may aestivate (become dormant) during periods of extreme summer drought.
Cultural Significance
Often associated with gardeners as a beneficial predator of pests. In folklore, they were incorrectly rumored to cause warts in humans; however, they are actually celebrated as symbols of transformation and luck in many cultures.
Interesting Facts
The American Toad can consume up to 1,000 insects in a single night. They also shed their skin every few days, typically eating the old skin after it is pulled off the body.