How can a male frog be distinguished from a female frog?
The male frogs may be distinguished by the presence of sound-producing vocal sacs. They also have a copulatory pad on the first digit of the forelimbs. Vocal sacs and copulatory pads are absent in female frogs. Also, a small round disc called the tympanum covers the ears of both male and female frogs. On males of most frog species, the circumference of this small disc is larger than the eye of the frog. On females of most frog species, the disc's circumference is equal to the size of the frog's eye.
