Southern Toad (Anaxyrus terrestris)
Order Anura, Family Bufonidae, Genus Anaxyrus, Species A. terrestris
Species
Southern Toad (Anaxyrus terrestris)
Family
Order Anura, Family Bufonidae, Genus Anaxyrus, Species A. terrestris
Size
Adult snout-to-vent length (SVL) typically ranges from 4.5 to 9 cm (1.8 to 3.5 inches). Females are noticeably larger and bulkier than males, exhibiting strong sexual dimorphism. Weight ranges roughly from 20 to 50 grams depending on sex and hydration.
Conservation
Listed as Least Concern on the IUCN Red List with a stable population trend. While locally impacted by habitat loss and road mortality, it remains abundant across its native range.
Description
The Southern Toad is a quintessential resident of the American Southeast, perfectly adapted to sandy coastal soils and humid subtropical climates. With its bumpy exterior, stout posture, and ornate cranial crests, it cuts a rugged and charming figure. Often encountered porch-light hunting for insects on warm summer nights, this adaptable amphibian is an integral and resilient member of its ecosystem.
Key Features
Pronounced cranial crests ending in distinct knobs, warty dry skin, prominent parotoid glands directly behind the eyes, and often a pale middorsal stripe running down the back.
Physical Description
The Southern Toad has a robust, stocky body with a blunt snout and prominent cranial crests on top of its head that typically end in distinct, upward-pointing knobs or horns. The eyes feature horizontal pupils and golden irises. Its limbs are relatively short and muscular, adapted for hopping and walking rather than leaping long distances, with unwebbed toes and no prominent toe pads. Large, kidney-shaped parotoid glands are situated immediately behind the eyes.
Skin Texture & Coloration
The skin is heavily warty and dry, covered in small, raised tubercles. Coloration is highly variable, ranging from reddish-brown, dark brown, grey, to olive, often featuring irregular dark spots and blotches. A light-colored middorsal stripe is frequently present down the center of the back. The belly is usually a pale, off-white or yellowish color, sometimes lightly speckled with dark spots.
Distinguishing Features
The most diagnostic feature is the presence of prominent cranial crests that end in distinct knobs or bumps behind the eyes. This separates it from the American Toad, which generally lacks such pronounced knobs, and the Fowler's Toad, which has cranial crests that do not form elevated knobs. The large parotoid glands touch or nearly touch the cranial crests.
Habitat
Inhabits sandy soils, pine flatwoods, prairies, maritime forests, and suburban yards. Prefers areas with loose soil suitable for burrowing, near shallow freshwater bodies such as temporary ponds, roadside ditches, and slow streams used for breeding.
Geographic Range
Native to the southeastern United States, ranging from southeastern Virginia south throughout Florida and west to Louisiana. It is strictly endemic to the coastal plain and lower piedmont regions of the American Southeast.
Behavior
Primarily nocturnal, spending daylight hours hidden underground in self-excavated burrows or beneath logs, rocks, and leaf litter. Locomotion is characterized by short, clumsy hops or a shuffling walk. When threatened, it inflates its body, lowers its head, and secretes noxious bufotoxin from its parotoid glands.
Diet & Feeding
An opportunistic generalist carnivore feeding on a wide variety of terrestrial invertebrates, including beetles, ants, caterpillars, spiders, earthworms, and centipedes. It uses a sticky tongue to capture moving prey within its strike range.
Reproduction
Breeds from early spring through autumn, typically triggered by heavy warm rains. Males gather at shallow temporary or permanent water bodies to call. Females lay long, double-stranded strings of black eggs submerged in water. There is no parental care after egg deposition.
Vocalizations
The advertisement call is a high-pitched, musical trill lasting several seconds, often compared to the sustained warble of a small bird or a muted metallic chirp. Choruses can be heard on warm, rainy nights near breeding sites.
Life Cycle
Eggs hatch into tiny, dark tadpoles within a few days depending on water temperature. The larval stage lasts between 30 to 60 days, culminating in rapid metamorphosis into miniature toadlets measuring about 1 cm. Sexual maturity is reached within one year.
Conservation Status
Listed as Least Concern on the IUCN Red List with a stable population trend. While locally impacted by habitat loss and road mortality, it remains abundant across its native range.
Toxicity & Defense
Secretes milky bufotoxin from its parotoid glands and skin when threatened, which is foul-tasting and mildly toxic to predators. The toxins are primarily defensive and harmless to humans unless ingested or rubbed into mucous membranes.
Ecological Role
Acts as both a significant predator of ground-dwelling insects and a vital prey base for snakes, birds, and small mammals. Tadpoles help regulate aquatic algae levels.
Similar Species
American Toad (Anaxyrus americanus) has crests that rarely form prominent knobs and more heavily spotted chest regions; Fowler's Toad (Anaxyrus fowleri) lacks distinct knobs on the cranial crests and usually has more than three warts per dorsal spot.
Observation Tips
Look near outdoor lights at night where flying insects attract foraging adults, or search around temporary rain pools during spring and summer evenings when males congregate to call.
Handling & Safety
Safe to handle gently with clean, wet hands, but care should be taken to avoid touching the face or eyes afterward due to skin secretions. Always wash hands thoroughly after handling any amphibian.
Seasonal Activity
Active throughout most of the year in the warmer parts of its range, slowing down or entering brief periods of brumation during cooler winter weeks. Peak activity coincides with warm, rainy spring and summer nights.
Cultural Significance
Frequently welcomed by gardeners and rural residents as beneficial pest control agents. They occasionally appear in southern folklore as harbingers of rain during dry summer spells due to their increased activity preceding storms.
Interesting Facts
Southern Toads are fantastic pest controllers in gardens, consuming vast quantities of agricultural pests and household insects every night. Their cranial knobs give them an ancient, armored appearance.