The male waterfowl evolution of a phallus to forcefully copulate with females has led to counteradaptations in females in the form of vaginal structures called dead end sacs and clockwise coils. The phallus that male waterfowl have evolved everts out of their bodies (in a clockwise coil) and aids in inseminating females without their cooperation. Most birds mate with the males balancing on top of the females and touching cloacas in a "cloacal kiss" this makes forceful insemination very difficult. While most male birds have no external genitalia, male waterfowl ( Anatidae) have a phallus. It is usually partially feathered and in some species features spines and brush-like filaments, and in flaccid state curls up inside the cloaca. A bird penis is different in structure from mammal penises, being an erectile expansion of the cloacal wall and being erected by lymph, not blood. Among bird species with a penis are paleognathes ( tinamous and ratites) and Anatidae (ducks, geese and swans). Most male birds (e.g., roosters and turkeys) have a cloaca (also present on the female), but not a penis. In most species of animals in which there is an organ that might reasonably be described as a penis, it has no major function other than intromission, or at least conveying the sperm to the female, but in the placental mammals the penis bears the distal part of the urethra, which discharges both urine during urination and semen during copulation. Even within the Vertebrata there are morphological variants with specific terminology, such as hemipenes. As an example, the intromittent organ of most cephalopoda is the hectocotylus, a specialized arm, and male spiders use their pedipalps.
The term penis applies to many intromittent organs, but not to all. Such organs occur in many animals, both vertebrate and invertebrate, but males do not bear a penis in every animal species, and in those species in which the male does bear a so-called penis, the penises in the various species are not necessarily homologous. "We hope to return her to her family when she can fit in.A penis (plural penises or penes ( /- n iː z/) is the primary sexual organ that male animals use to inseminate females (or hermaphrodites) during copulation. "We are trying to establish their eye contact first and then physical contact," Zhu said. The fertility rate for chimpanzees is not high in China and the mannies have not given up trying to form a bond between the chimp and her birth mother.
"Hearing our footsteps, she gets excited," he said. Over the past months, the mannies have grown familiar with the chimp, figuring out her needs based on her different cries, chuckles and gestures. "She likes it very much and often kisses it," Zhu said. To keep her company, the mannies got her a toy bear. In addition to sleeping for 12 hours per day, she spends most of her time playing alone. "She is now able to crawl and soon she will be able to walk." "Although we are all fathers ourselves, we never took care of our own children so meticulously," he said. "Sometimes it took more than 40 minutes to feed her, as she often did not cooperate." She would be scalded if it was too hot, and suffer from diarrhea if it was too cold," Zhu said.
"We had to be cautious about the water temperature. They took turns to feed her every three hours at the beginning, including disinfecting milk bottles, mixing the milk powder, and feeding and burping her. The mannies used information they found on the internet to help them raise the chimp. "We tried several times to have Laoqi accept the baby, but failed," so the keepers have become the chimp's "mannies", said Zhao Jing, 40, another keeper. It was the mother's first baby and after the delivery, the mother, Laoqi, refused to even touch the baby. "It's four times the weight whens he was born," Zhu said. "Local media have suggested soliciting a name from the public," Zhu said.Īs the chimp turned 6-months-old on Wednesday, they were delighted to find she had reached 4 kilograms. "She is fawning, requesting a kiss," Zhu said, also smiling.Īt Taiyuan Zoo in North China's Shanxi province, Zhu, 30, and his three male colleagues are playing mom to a female chimp deserted by her mother soon after she was born in May. The little cutie looked up at him, pursing her lips slightly. Zhu Xiangbo carried the baby in his arms, touching her head gently with one hand, as he used the other to put a feeding bottle to her mouth. (Photo by Wei Liang / China News Service) She was abandoned by her mother soon after she was born in May. A 6-month-old female chimp is fed at Taiyuan Zoo in Shanxi province earlier this month.
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