Vocal Sac
Vocal Sac
In some frog species, you can determine the sex of a frog based on the development of a vocal sac. If the vocal sac is present, the frog is a male.
The lungs, nostrils, skin, and vocal sac.
Because only the males calls.
Although I am not entirely sure, I think it might be an egg sac or a vocal sac? Not entirely sure though. Try researching it in Google under the description you gave us.
You are possibily reffering to the inflation and deflation of a frogs "VOCAL SAC."
because only males emit mating calls.
The address of the Sac County Historical Society Inc is: Po Box 334, Sac City, IA 50583
In some frog species, you can determine the sex of a frog based on the development of a vocal sac. If the vocal sac is present, the frog is a male.
Poison Dart frogs like to mate in the Spring!
There is no such thing as an "ovarian sac". The amnion is a membrane building the "amniotic sac" that surrounds and protects an embryo.