In the Andamans Islands along the east coast of India, a frog matures and lays eggs in a state of reverse Sucking, BBC quoted a new study as saying.
Both Indian and American scientists said that both the male and the offspring of Charles Darwin frog lay upside down above tree holes, separated from water. The newly bloomed crab nests will fall into the water below and develop into a free-swimming crab nests.
Indian biologist Sathyabhama Das Biju commented: "This is remarkable. laying reverse-ending eggs is the most unique behavior in this frog species. No other frog is known to lay eggs above tree nests in an upside-down position, the entire body separate from the water.
Almost all of the world's 7,708 frog species matriculate and lay eggs in water and some other shore habitats. The eggs hatch during mating, while the male releases sperm to fertilize them.
A team of Indian and American biologists from the University of Delhi, the Indian Zones Survey, Harvard University and the University of Minnesota camped 55 nights a three-year during the rainy season to study the reproductive behavior of Charles Darwin frog. Their latest research was published in the scientific journal Breviora.
The uniqueness of this species does not stop at the way they matriculate. Even the way they call each other to match is different.
Researchers have found that male animals often have three ways to call to attract their own. When the male's aggressive noises cannot repel the competitor, they will start fighting, using their hands, feet, kicks and punches. They even bit off the opponent's body parts, even the head.
If the male successfully climbs the human race, the nearby male can fight against a pair of mating women. They even try to squeeze their heads between the mating frog pair to separate them.
Mr. Sathyabhama Das Biju pointed out: In our observations, fights between men rarely lead to death. It is surprising how aggressive this species is, such as the act of biting off body parts."
The behavior of opposite-parent mating has been degraded to prevent aggressive male workers from disrupting the egg-laying process by jostling the pair of frog mating.
This discovery is an example of the diversity of bicycles and previously unknown reproductive behaviors, said James Hanken, a member of the research team from Harvard University. Especially the under researched areas in Asias biodiversity hotspots.
Charles Darwin's frog, named after a famous naturalist, is only present on a few islands in the Andaman Islands and cannot be found anywhere else. They are not common and only exist in some specific forest environments. The International Union for Conservation of Nature (IUCN) lists this species as an "endangered species" due to the population being degraded and the habitats being degraded.
