Southern Toad vs Oak Toad: Size, Call and Habits
The oak toad (Anaxyrus quercicus) is North America’s smallest toad, about 1.75 inches at most, with a light stripe down its back and a chirping call. The southern toad (Anaxyrus terrestris) is larger, typically 1.6 to 2.9 inches, with knobbed head ridges and a long trill. Oak toads are often active by day, while southern toads are mainly nocturnal.
Both toads live on the Southeast Coastal Plain, and both turn up in sandy pine woods. A small toad in the leaf litter might be either a young southern toad or a fully grown oak toad.
This guide compares them by size, markings, call, habits and breeding. It also explains why a tiny toad is not always an oak toad.
How this was made: prepared with AI assistance and checked against the sources listed at the end. Images are AI-generated illustrations, not photographs of real animals or products.
Key Takeaways
- Oak toads are the smallest toads in North America, around 1.75 inches at most.
- Southern toads are typically 41 to 75 mm and can reach over 100 mm in places.
- Oak toads have a light mid-back stripe and proportionally large glands.
- Oak toads are primarily diurnal; southern toads are mainly nocturnal.
- Young southern toads can be as small as an oak toad, so check call and markings.
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Side-by-side comparison
This table combines details from the Savannah River Ecology Laboratory (SREL) and South Carolina PARC.
| Feature | Southern toad | Oak toad |
|---|---|---|
| Typical length | 41 to 75 mm (1.6 to 2.9 in) | Up to about 1.75 in (4.4 cm) |
| Head ridges | High, ending in prominent knobs | Not noted as knobbed |
| Back | Brown, blotched, faint stripe may be present | Light mid-back stripe, brown and black spots |
| Call | Shrill, high trill, 2 to 8 seconds | High-pitched chirp |
| Activity | Mainly nocturnal | Primarily diurnal |
| Habitat | Sandy soil: pine woods, fields, yards | Open sandy longleaf and southern pine forest |
Size: the biggest difference
SREL calls the oak toad the smallest North American toad, reaching about 1.75 inches (4.4 cm). Southern toads are usually 41 to 75 mm, or 1.6 to 2.9 inches, and island populations reach 113 mm.
A fully grown oak toad is therefore about the size of a small adult southern toad. South Carolina PARC says southern toad adults average 2 to 4 inches, so the gap widens with larger animals.
Watch for young southern toads. Very young toads of different species look alike, according to University of Florida wildlife sources. A tiny toad is not proof of an oak toad.
Markings and shape
The oak toad has a light stripe down the middle of its back, with irregular brown and black spots, and proportionally large glands behind the eyes, according to SREL.
South Carolina PARC adds that the oak toad has shorter limbs and darker colouring, and does not hold itself as upright as a southern toad.
The southern toad is stout, brown and warty, with high head ridges ending in knobs. A faint pale back stripe can appear, so the stripe alone is not enough.
Calls
Male oak toads call with a high-pitched, chirp-like sound, made with a distinctive elongated vocal sac that extends dramatically, SREL notes. The southern toad trills for 2 to 8 seconds in a shrill, steady pitch.
The two calls are easy to separate once heard: a short high chirp points to an oak toad, and a long, steady trill points to a southern toad.
Daily activity
Habits differ. SREL describes the oak toad as primarily diurnal, which is unusual for toads. It is often active during daylight.
Southern toads are mainly nocturnal, according to Animal Diversity Web. They hide in burrows or under cover by day and feed at night. See our guide on whether southern toads are nocturnal.
Habitat and breeding
Oak toads favour open, sandy areas such as longleaf pine and other southern pine forests, where they shelter under logs and leaf litter. They are restricted to the Coastal Plain. They breed in shallow, fishless pools formed by heavy rains.
Southern toads use a wider range of sandy habitats, including farm fields and yards, and breed in ponds, ditches and temporary pools from about February to October. Females lay 2,500 to 4,000 eggs.
Are they in the same places?
Often, yes. Both live on the Coastal Plain, and a sandy pine woodland can hold both. That overlap is why a quick glance can mislead. Check the call and the markings, and use the size rule only for clearly adult animals.
Keeping and handling
Neither species suits casual handling. Wash your hands after touching any toad. Oak toads are tiny, so avoid picking them up at all. For general species details, read what a southern toad is.
Frequently Asked Questions
What is the smallest toad in North America?
The oak toad, at about 1.75 inches (4.4 cm), according to SREL.
How big is a southern toad compared with an oak toad?
Southern toads are typically 41 to 75 mm. Oak toads are about 44 mm at most, so adults overlap only at the small end.
Are oak toads active in the day?
Yes. SREL describes them as primarily diurnal, which is unusual for a toad.
What does an oak toad sound like?
A high-pitched, chirp-like call made with an elongated vocal sac.
Do oak toads have a stripe?
Yes. A light mid-back stripe is a main field mark.
Where do oak toads live?
On the Coastal Plain of the southeastern United States, in open sandy pine forests.
Can a baby southern toad look like an oak toad?
Yes. Very young toads look much like each other, so use call and habitat as well as size.
Bottom Line
Size is the first check, but it fails on young toads. Combine size with back stripe, call and time of day for a safer answer.
For another comparison, read southern toad vs Fowler’s toad.
Sources
- Savannah River Ecology Laboratory: Oak Toad, accessed Oak toad size, stripe, call, activity
- Savannah River Ecology Laboratory: Southern Toad, accessed Southern toad size, call, breeding
- South Carolina PARC: Southern Toad, accessed Oak toad comparison
- Animal Diversity Web: Southern toad, accessed Nocturnal habits
- UF Wildlife: Southern Toad, accessed Young toads
- CDC: Reptiles and Amphibians, accessed Salmonella
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