Figure 5
Crosses of green toads from Sicily. a: Cross B. balearicus female × B. siculus male; b: reciprocal cross B. siculus × B. balearicus; c-h F1-offspring from cross shown in a; c-d: offspring in the age of seven days, showing dead and malformed embryos and tadpoles in comparison with apparently normally developing ones; e: about one-months old normal tadpole (left) in comparison with leucistic "large" tadpole (right); f: in the age of two months (from left to right): retarded tadpole, "giant" leucistic tadpole with developmental arrest, malformed dwarfed tadpole, leucistic tadpole that turned later out to be incapable of metamorphosis, apparently normally metamorphosing tadpole; g: adult, two-year-old F1-male; h: adult, two-year-old F1-female. Photographs: M. Stöck.