The spiny toad, spiny common toad, or giant toad (Bufo spinosus) is a species of toad native to the Iberian Peninsula, southern France, extreme northwestern Italy, and North Africa (Morocco, Algeria, and Tunisia). There is an isolated population in Jersey in the Channel Islands which may be a distinct species, the Jersey Toad. For much of the 20th century, it was considered either a synonym or a subspecies of common toad Bufo bufo, but it is now classified as a separate species.
These toads feed on a number of invertebrates from earthworms to insects and woodlice.
Adult males measure 58.6–112 mm (2.3–4.4 in) and adult females 65–180 mm (2.6–7.1 in) in snout–vent length.
Bufo spinosus is a large and robust toad with a snout-vent length of 58.6 - 112 mm in males and 65 - 180 mm in females. Its head is relatively broad, and the region between the eyes is either flat or slightly concave. The snout is short and rounded. The tympanum is subtly visible and rounded, and its diameter does not exceed half the eye. The parotoid glands are large, elongated, and divergent at the posterior end. The eyes are prominent with a horizontally oval pupil. The skin is warty on the back and granular on the underside. Its warts usually end in a keratinized tip, resulting in a spiny appearance, though not all individuals express this. These keratinized warts are especially prominent between the corner of the mouth and the parotoid. The fingers, of which the third is the longest, are short.
Bufo spinosus is a primarily nocturnal species, though it may also be active in the daytime during the reproductive season. It generally prefers standing bodies of water, though it is also found near areas of flowing water. It is very drought-tolerant, due in part to its ability to absorb 21% of its body weight in water per minute. It is assumed to be able to tolerate huge losses of water as B. bufo, a congeneric species, can lose up to 20% of its weight in water without any deleterious effects (Ortiz-Santaliestra 2014).
Males have a weak and short mating call, and call throughout the day and night. Breeding usually takes place in spring, though this varies geographically, with populations in warmer areas generally breeding earlier in the year and populations in colder areas generally breeding later in the year. Amplexus is axillary. Females lay anywhere from 2000 – 11000 eggs at a time, which are around 3 mm in diameter and connected in strings and attached onto aquatic vegetation. It has a geographically variable larval period, with the period lasting 65 - 108 days in the southern Iberian Peninsula, and 55.5 days in Doñana National Park in Andalusia, Spain (Ortiz-Santaliestra 2014).
