Male has two internal vocal sacs.

Male with an internal subgular vocal sac.

Those Vegans have their brains well protected in tough internal sacs.

Males have two internal vocal sacs.

The male has two well-developed internal subgular vocal sacs.

The former have a paired internal vocal sac and three short ridges of small black spines along the inner surface of the first manual digit.

Male with two internal vocal sacs, the openings of which are very small.

Males have internal vocal sacs and oval flat glands on the inner side of their arms.