Golden toad  (Incilius periglenes)

Description

The golden toad has not been seen since 1989, and is believed to be extinct (1). This toad displays extreme sexual dimorphism; males are a brilliant orange colour but females are dark and mottled with yellow-edged red blotches. Females also tend to be slightly larger than males. In juveniles, however, the sexes cannot be determined as they are very similar (2).

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