It is not swollen, the male frog's thumb is Enlarged.
Frogs have 4 fingers and 1 vestigial finger, and 5 toes + 1 vestigial toe. The vestigial fingers and toes are positioned on the inner side (bode-side) of the hand/foot, pointing towards the body. In live specimens these digits are not visible, only when a frog is dissected it can be seen.
Yeah it's that one finger called a thumb. :3
The brown spot is the vestigial eye (represented by a white dot) located between the eyeballs.
Males use it to grab females for mating. It's one way to males and females apart.
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.
a frog can be as same as your thumb and then as big as your to fist put together or larger, it all depends on what kind or species it is
evolution
Vestigial StructureA vestigial structure is a structure that appears to no longer have a use in the body.
The African jagged thumb spitting frog
if the frogs front hands had large thumb pads it was male
Vestigial StructureA vestigial structure is a structure that appears to no longer have a use in the body.