American Toad (Anaxyrus americanus)
Order Anura, Family Bufonidae, Genus Anaxyrus. This family consists of 'true toads', characterized by parotoid glands and dry, warty skin.
Species
American Toad (Anaxyrus americanus)
Family
Order Anura, Family Bufonidae, Genus Anaxyrus. This family consists of 'true toads', characterized by parotoid glands and dry, warty skin.
Size
Adult SVL ranges from 51 to 110 mm (2-4.25 inches). Females are generally larger than males. Weight varies based on hydration and egg production, typically 20-50 grams.
Conservation
IUCN Status: Least Concern. Population is stable, though local declines can occur due to habitat fragmentation or pollution of breeding sites.
Description
The quintessential 'garden toad' of North America. Often found nestled in garden mulch or under porches, this toad is a silent sentinel of the night, easily recognized by its textured skin and rhythmic trilling song in the spring.
Key Features
Presence of cranial crests, parotoid glands, one or two warts per dark spot, and dry, warty skin.
Physical Description
Robust, squat body with short limbs. The head is broad with large, distinct parotoid glands behind the eyes. It features a horizontal pupil and prominent cranial crests on the top of the head.
Skin Texture & Coloration
The skin is dry and covered in numerous large warts (tubercles). Coloration usually ranges from tan, brown, or olive to reddish-brown, with darker spots containing only one or two warts each. A light mid-dorsal stripe is often present.
Distinguishing Features
Identification is confirmed by cranial crests that are either separate from or only connected to the parotoid glands by a short spur. Its dark spots typically contain strictly one to two warts.
Habitat
Highly adaptable. Occupies forests, grasslands, gardens, and agricultural fields. Requires semi-permanent or ephemeral shallow water bodies or slow streams for breeding.
Geographic Range
Large range across eastern North America, from south-central Canada through the eastern United States to the Dakotas and south to Mississippi.
Behavior
Primarily nocturnal but often active during the day in humid weather. It is terrestrial, using its short legs for hopping or walking, and can burrow into the soil for moisture or protection.
Diet & Feeding
Generalist carnivore eating beetles, snails, slugs, earthworms, and spiders. It uses an 'ambush' strategy, flicking out a sticky tongue to capture moving prey.
Reproduction
Prolonged breeders from March to July triggered by warm rain. Males call from pond edges; amplexus is axillary. Eggs are laid in long, gelatinous strings (up to 20,000 eggs).
Vocalizations
A long, melodic, high-pitched musical trill that can last between 6 to 30 seconds. In a chorus, the overlapping trills create a vibrating, ethereal soundscape.
Life Cycle
Eggs hatch in 3-12 days; tadpoles are small and black, metamorphosing in 5-10 weeks. Juveniles (toadlets) are tiny versions of adults. Sexual maturity in 2-3 years.
Conservation Status
IUCN Status: Least Concern. Population is stable, though local declines can occur due to habitat fragmentation or pollution of breeding sites.
Toxicity & Defense
The parotoid glands secrete bufotoxins which are milky, poisonous alkaloids. These deter predators by irritating mucous membranes or causing cardiac distress if ingested.
Ecological Role
Important mid-level predator of invertebrates and a food source for hognose snakes and certain birds. Adults and tadpoles provide significant nutrient transfer between aquatic and terrestrial systems.
Similar Species
Fowler's Toad (Anaxyrus fowleri): Has 3 or more warts per spot and crests touch the parotoid glands. Woodhouse's Toad: Crests are L-shaped.
Observation Tips
Look near porch lights at night where they hunt attracted insects, or listen for their long trill near shallow, sun-warmed pools on spring evenings.
Handling & Safety
Safe to watch, but wash hands immediately after touching due to parotoid secretions. Avoid touching eyes or mouth. They do not cause warts in humans but may urinate as a defense.
Seasonal Activity
Active from early spring through autumn. In winter, they hibernate by burrowing deep into the soil below the frost line.
Cultural Significance
Commonly depicted in folklore as the companion of witches or as a sign of rain. In gardens, they are cherished as biological pest controllers.
Interesting Facts
A single female can lay up to 20,000 eggs. They are known for 'homing', often returning to the same breeding pool year after year despite environmental changes.
Notes
Brown frog