Hi
On 20.05.2010 I found recently spawned eggs of common toad in my garden pond (Gorzow Wielkopolski). During that season this species spawned also in normal term- 29.03.2010. According to
Juszczyk W. (1987) Płazy i gady krajowe. Tom 2. Płazy (Amphibia). PWN, Warszawa In the lowlands of Poland latest terms of B. bufo spawning occur during the second part of april. And according to this publication the latest therm of mating vocalisation is 13.V. Thus, I think that my observation confirms possibility of occurrence B.b. x B. viridis and B.b. x B. calamita hybrids in Poland. Below You can see photograph of spawn from 20.05.2010 and a photohraph that shows size differences between tadpoles from 20.05.2010 and those from 29.03.2010
Photograph was taken on 21.05.2010.
Photograph was taken on 30.05.2010.
Greetings
Michal