He designed an experiment involving European midwife toads, a species of toad that lays its eggs on land (toads that spawn in water possess a spiny black area on their forelimbs to assist them with grasping the female during mating).
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an experiment involving European midwife toads, a species of toad
European midwife toads
its eggs
a spiny black area
L:in water
them with grasping the female during mating