Head to head
Common Spadefoot vs Couch's Spadefoot Toad
The common spadefoot of Europe and Couch's spadefoot of the American Southwest both dig backward into soil using a hard spade on each hind foot, but their very different climates have sent their populations in opposite directions.
| Common Spadefoot | Couch's Spadefoot Toad | |
|---|---|---|
| Scientific name | Pelobates fuscus | Scaphiopus couchii |
| Range | Central and eastern Europe | Southwestern US and Mexico |
| Population trend | Decreasing, vanished from parts of its range | Stable |
| Time spent underground | Most of the year | Eight to ten months a year |
| Larval period | Typical for the region | As short as about a week |
| Breeding trigger | Shallow temporary pools after rain | Monsoon rain specifically |
| Conservation status | Least Concern | Least Concern |
| Diet | Insectivore | Carnivore |
Common Spadefoot vs Couch's Spadefoot Toad: common questions
Why has the common spadefoot declined while Couch's spadefoot remains stable?
The common spadefoot depends on shallow temporary pools and light, diggable soil across Europe, conditions that intensive farming has drained, ploughed, and built over across large parts of its range, while Couch's spadefoot occupies desert habitat in the American Southwest that has faced comparatively less of this specific kind of agricultural conversion, letting its population remain stable.
Which spadefoot has the faster tadpole development, the common spadefoot or Couch's spadefoot?
Couch's spadefoot has the more extreme adaptation, with tadpoles capable of completing metamorphosis in as little as about a week in warm water, one of the shortest larval periods of any frog or toad, a race against evaporation suited to the very short-lived desert pools it breeds in after monsoon rain.
Do both spadefoots spend most of their lives underground?
Yes, both species spend the great majority of the year buried underground, with Couch's spadefoot documented remaining buried for eight to ten months at a stretch in a moisture-retaining cocoon, while the common spadefoot follows a broadly similar pattern of extended underground dormancy between breeding opportunities in its own more temperate range.