Natterjack n. : A European toad (Bufo calamita), having a yellow line along its back.

Example:
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Taxonomy
Natterjack Toad, species, Epidalea, Bufo calamita, toad, free encyclopedia, Ireland, Bufonidae, toad species, sparse vegetation, shallow pools, least concern, Northern Europe, Life history, search, Phylum, Anura, Family.

Defination from the web:
Natterjack Toad (Epidalea calamita, formerly Bufo calamita) is a toad native to sandy and heathland areas of Northern Europe. ... The loud mating calls are important because the Natterjack Toad is often present in low numbers so it is important that the sexes can find each other. ...