obstetric : Idioms & Phrases

• noun European toad whose male carries the fertilized eggs wrapped around its hind legs until they hatch
  Alytes obstetricans; midwife toad.
  

WordNet

• (Zoöl.), a European toad of the genus Alytes, especially A. obstetricans. The eggs are laid in a string which the male winds around his legs, and carries about until the young are hatched.

Webster 1913