Before birth, babies can tell the difference between loud sounds and voices. They can even distinguish their mother's voice from that of a female stranger. But when it comes to embryonic learning(胎教), birds could rule the roost. As recently reported in The Auk: Ornithological Advances, some mother birds may teach their young to sing even before they hatch(孵化)。New-born chicks can then imitate their mom's call within a few days of entering the world.

    This educational method was first observed in 2012 by Sonia Kleindorfer, a biologist at Flinders University in South Australia, and her colleagues. Female Australian superb fairy wrens were found to repeat one sound over and over again while hatching their eggs, When the eggs were hatched, the baby birds made the similar chirp to their mothers—a sound that served as their regular “feed me!”call.

To find out if the special quality was more widespread in birds, the researchers sought the red-backed fairy wren, another species of Australian songbird. First they collected sound data from 67 nests in four sites in Queensland before and after hatching, Then they identified begging calls by analyzing the order and number of notes. A computer analysis blindly compared calls produced by mothers and chicks, ranking them by similarity.

    It turns out that baby red-backed fairy wrens also emerge chirping like their moms. And the more frequently mothers had called to their eggs, the more similar were the babies' begging calls. In addition, the team set up a separate experiment that suggested that the baby birds that most closely imitated their mom's voice were rewarded with the most food.

    This observation hints that effective embryonic learning could signal neurological(神经系统的) strengths of children to parents. An evolutionary inference can then be drawn.“As a parent, do you invest in quality children, or do you invest in children that are in need? ”Kleindorfer asks. “Our results suggest that they might be going for quality. ”

    The Island Rule is one of the best explanations scientists could give to the observable phenomenon that animals and humans have evolved (演变) depending on the resources available in their habitat (栖息地). Through time, scientists have noticed through fossil (化石) records that some large animals from mainland habitats have dwarf (矮小的) versions in bland habitats.

    A report from BBC described the existence of what scientists call “hobbit island” off a small island somewhere in Indonesia. It was given such a name because fossil records of tiny, humanlike creatures have been found in the region. What they called as “hobbits” or “Homo Floresiensis”, are only as tall as one meter and arc small versions of early human species with tinier brains.

    Though scientists cannot perfectly trace the origin of the “Homo Floriensis”, they believe that they arc human relatives, but it is the “island life” that has caused them to evolve as they have. Scientists have noticed through fossil records and existing organisms (有机体) today that it seems if large animals grow small in islands while small animals grow large in larger islands.

In theory, animal and human bodies have adjusted to the available food and fresh water in their habitats. Since there is no opportunity for them to leave their island, they might as well adapt.

    New York Magazine explained that islands usually have fewer predators (捕食者) than mainland ecosystems. However, it is the lack of resources that cause the death of many animals. As a means of natural adaptation, the bodies of these animals have evolved smaller than their ancestors, making their bodies require fewer resources.

    A report from Web Ecoist listed down a few examples of animals that have shrunk significantly compared with their ancestors. Some of these include the Bali tiger as small as leopards (豹).

    All over the world, children in hospital are being treated with a new kind of medicine：Laughter. Lucy is 23 and works for Theodora Children's Trust. She is one of many clown (小丑) doctors who bring a smile to the faces of sick children.

    “I'm a Theodora clown doctor. I call myself Dr Looloo. I spend two days a week in children's hospitals, making funny faces, telling jokes, and doing magic tricks. As I walk into the wards(病房) I blow bubbles, shake hands with the kids, and make up nonsense songs for those children well enough to sing. I take special balloons to make 'balloon animals' and tell funny stories about them.

    I'm naturally a very cheerful person. I've always been a clown. In fact my father's a clown and I started working with him when I was eight years old. I knew it was just the job for me and I became a clown doctor because I think it's a great way to cheer up sick, frightened children in hospital.

    Being a clown in hospital is very tiring both physically and emotionally. We have to learn not to show our feelings, otherwise we'd be useless. Clown doctors are sensitive but this is not a side most people see. To the children we're happy all the time. I'm still learning to allow myself to feel sad occasionally. There working with a very sick little girl from Bosnia who speaks no English, so our only common language is laughter.

    At weekends I participate in events to raise money for Theodora Children's Trust. It's a charity, so we are paid with the money people give. Being a clown doctor makes the worries of everyday life seem small. All in all I feel honoured to do this job.”

    In recent years, much of the sea ice that polar bears use as a hunting platform for seal meals has melted, forcing some bears — particularly young males — farther north or onto land, where they are not as skilled at hunting. When stuck on land for months, a polar bear typically is forced to survive on its own fat reserves.

    The bears were listed earlier this year as a threatened species under the U. S. Endangered Species Act as populations have declined. Meanwhile, snow geese are booming near the western Hudson Bay, and there are in fact too many of them. Their eggs can be a good food source. The geese nest on tundra (冻原；苔原) that some bears have retreated to.

    "Over 40 years, six subadult (接近成年的) male bears were seen among snow goose nests, and four of them were sighted after the year 2000," says Robert Rockwell. "I've seen a subadult male eat goose eggs whole or press its nose against the shell, break it, and eat the contents."

    Ice is melting, on average, 0.72 days earlier each year in the region studied. Snow geese are hatching eggs about 0.16 days sooner each year, according to Rockwell and his graduate student Linda Gormezano. Current trends indicate that the arrival of polar bears will correspond to the average hatching period in 3.6 years, and egg consumption could become a viable option, which the researcher concluded in a statement released today.

    A polar bear, the largest land carnivore (食肉动物), would need to consume the eggs of 43 nests to replace the energy gained from the average day of hunting seals, but Rockwell and his colleagues figure that while many polar bears may starve in coming years, the resourceful animals just might survive disappearance.

    Polar bears survived a warm period about 125,000 years ago, when sea level was 12 to 18 feet higher than it is now and trees lived above the Arctic Circle, the scientists point out.  "They've been through the warm period before，" Rockwell said.

    The polar bears' potential movement to a diet of more eggs brought to mind a quote by Ilkoo Angutikjuak, an Inuit who lives in the Canadian province of Nunavut, in the February 2008 issue of Natural History magazine, Rockwell said. Angutikjuak said: "The animals will adapt. I've heard that because they depend on sea ice, polar bears will disappear, but I don't believe it. They are very adaptable. As the sea ice changes, polar bears might get skinnier and some might die, but I don't think they will disappear."

    Hundreds of children are being treated for sleep problems in Wales every year. In some cases, babies, infants and teenagers have been admitted to hospital while in north Wales alone.

    The Children's Sleep Charity said many children were suffering from lack of sleep mainly because of technology use. Public Health Wales said sleep was as important to a child's health as healthy eating and exercise, and children with poor sleep patterns were more likely to be fat.

    Statistics obtained under the Freedom of Information Act by BBC Wales found at least 408 children have been admitted to hospitals across Wales suffering from sleep disorders since March 2013.

    Children aged between 0 and4 made up the highest number of inpatients (住院病人), with some newborns being treated for sleep-related problems from the day of birth.

    Vicki Dawson, who set up the Children's Sleep Charity (CSC), said sleepless nights were putting both children and parents in anxiety. "Their weight and growth may also be affected as well as their mental health," she said.

    Teachers said children showing signs of sleep shortage and tiredness in class were a concern as they couldn't concentrate for long periods.

    Psychologist Amy McClelland, of Sleep Wales, said a common problem was children being "over excited" and "not having the chance to relax property" before bed and families should get back to basics. "Think 1950s family home. Dinner as a family, read, chat, a film maybe, lights off and then bed." She added.

    Unbelievable Stories of Animals Acting Just Like Humans

    Horses are picky eaters

    Horses have an even better sense of smell than humans do. When horses raise their noses and open their nostrils (鼻孔) , their nervous system allows them to sense smells we can't sense. This might explain why they refuse dirty water and carefully move around meadows, eating only the tastiest grasses, experts say.

    Whale says thanks

    In 2011, a whale expert spotted a humpback whale trapped in a fishing net and spent an hour freeing it. Afterward, in an hour-long display of thanks, the whale swam near their boat and leaped into the air about 40 times.

    Pandas like to be naughty

    Is there anything more lovely than a baby panda, except maybe a human baby? In fact, baby pandas sometimes behave like human babies. They sleep in the same positions and value their thumbs. Pandas are shy by nature for its shy behaviors such as covering its face with a paw of ducking its head when confronted by a stranger.

    A cat honors its owner

    Paper towels, and a plastic cup are just a few of the gifts that Toldo, a devoted three-year-old gray-and-white cat, has placed on his former owner Iozzelli Renzo's grave every day since the man died in September 2011. Renzo adopted Toldo from a shelter when the cat was three months old, and the two formed an inseparable bond. After Renzo passed away, Toldo followed the coffin to the cemetery, and now "stands guard" at the grave for hours at a time.