Head to head
Woodhouse's Toad vs Red-spotted Toad
Woodhouse's toad and the red-spotted toad both live across the arid and semi-arid central and southwestern United States, but one has thrived by tolerating almost any habitat it encounters, while the other has thrived by specialising tightly on rocky desert crevices and the smallest available water.
| Woodhouse's Toad | Red-spotted Toad | |
|---|---|---|
| Habitat strategy | Broad generalist | Rocky desert specialist |
| Body shape | Typical toad body | Small, notably flattened |
| Skin glands | Large parotoid glands | Numerous small red-tipped tubercles |
| Minimum breeding water needed | Ponds, ditches, backwaters | Extremely small, short-lived rock pools |
| Hybridises with relatives | Frequently | Less commonly documented |
| Habitat tolerance | Natural and heavily human-altered | Rocky desert and canyon habitat |
| Conservation status | Least Concern | Least Concern |
| Range | Central United States | Southwestern US and Mexico |
Woodhouse's Toad vs Red-spotted Toad: common questions
Which toad is more likely to be found in a city park, Woodhouse’s toad or the red-spotted toad?
Woodhouse's toad is by far the more likely of the two to turn up in an urban park or other heavily human-altered habitat, given its documented tolerance for agricultural land, farmland, and city parks alongside more natural habitats, while the red-spotted toad is tied much more closely to specific rocky desert and canyon habitat with abundant crevices, making it far less likely to be encountered in a typical urban green space.
Why can the red-spotted toad breed in such tiny puddles?
The species has adapted its breeding timing and tadpole development specifically to exploit the small, shallow, short-lived rock pools common in its arid habitat, breeding quickly after rain and developing rapidly enough to complete metamorphosis before an especially small pool potentially evaporates, a level of specialisation Woodhouse's toad, which typically relies on larger and more persistent water bodies, has not developed to nearly the same degree.
Why does Woodhouse’s toad hybridise with other toads so much more than the red-spotted toad?
Woodhouse's toad's breeding calls, timing, and choice of breeding habitat overlap considerably with several other closely related Anaxyrus toad species across its wide central United States range, creating frequent opportunities for cross-species mating, while the red-spotted toad's more specialised rocky desert habitat and particular breeding requirements bring it into similarly close contact with fewer competing relatives, resulting in less commonly documented hybridisation for the species.