A pair of giant pandas will return to China after two decades at the Memphis Zoo in Memphis, the US state of Tennessee, as the zoo’s current giant panda loan agreement【小题1】 the Chinese Association of Zoological Gardens is coming to【小题2】 end.

Ya Ya and Le Le came to Memphis in 2003, and the contract【小题3】 (renew) in 2013. The current loan agreement will end in 2023.

“Ya Ya and Le Le have been necessary parts of the Memphis community for the past 20 years and we are【小题4】 (gratitude) for the time we were able【小题5】 (spend) with them,” the zoo said in a【小题6】 (state) .

The Memphis Zoo also stressed that it has been a privilege to host these incredible bears and【小题7】 the impact the Chinese culture has had【小题8】 the City of Memphis “will forever be remembered.”

“Guests have traveled to Memphis to get a small taste of the exquisite culture of China and Memphis Zoo is so thankful to have been a middle ground between two great nations,” the zoo said. “It has been a【小题9】 (wonder) 20 years developing this relationship with Ya Ya, Le Le, and the Chinese Association of Zoological Gardens and we look forward to【小题10】 (continue) this partnership in the future,” it added.

Gorgeous Rare White Grizzly Bear Sighted In Canada

With less than 55,000 grizzly bears left in the wild across North America, the sighting of even one is a cause for celebration. Hence you can only imagine 【小题1】 delighted Cara Clarkson and her family were when they spotted two young grizzlies —【小题2】 with rarely seen all-white fur— wandering alongside the Trans-Canada Highway near Banff, Canada.

“We knew we were so lucky because white grizzly bears are unheard of,” Cara told St. Albert Today. The Director of Operations at the Rimrock Resort Hotel in Banff, who shared her images and video 【小题3】 social media, said the sighting was a real treat given that the family was out celebrating two birthdays — her husband Tyler's on April 26 and her three-year-old son Beau's on April 24.

Mike Gibeau, a carnivore (食肉动物) specialist for Parks Canada, says 【小题4】 Clarksons and other motorists who have encountered the white bear — now called Nakoda, which means “friend” in the native language — are truly lucky. For, 【小题5】 there are a few variations of white bears to be found, such as the Kermode bears in British Columbia and the polar bears in the Arctic, white grizzly bears are extremely rare.

Though this is the first time that the world 【小题6】 (see) the white grizzly, park rangers have known of Nakoda's existence since 2018. Jon Stuart-Smith, a Parks Canada wildlife management specialist says his team first spotted the bear and its sibling traveling with their mother, who they tracked from 2012 to 2017 as part of a Canadian Pacific-Parks Canada research project 【小题7】 (analyze) the mortality rates of the region's grizzly bears. The park officials never publicized the unique bear 【小题8】 fear that it would be chased by fans eager to catch a glimpse. “They're just young bears trying to figure out how to make a living on the landscape, and haven't had enough time to know they 【小题9】 avoid the highway and people. These unusual-looking animals get hunted mercilessly by photographers, and so 【小题10】 (little) we talk about them, the better.”

Killer Rabbits

You’d never think of rabbits as dreadful, destructive creatures, would you? Rabbits are cute and love-able. However, Australians discovered 【小题1】 harm these cute creatures can do the hard way.

Rabbits were introduced to Australia in 1788 as food animals. By 1827, they were running around large estates, and in 1859, disaster struck. A man released 12 wild rabbits onto his property for hunting and he 【小题2】 have thought that was harmless fun. But Australia has no predators（捕食者）【小题3】 (adapt) to killing rabbits and none of the diseases that kept their populations 【小题4】 control in Europe. The loose rabbits bred like, well, rabbits, and began to take over the countryside. Within a few decades, there were millions. By 1950, there were 600 million rabbits in Australia.

Six hundred million hungry rabbits could do real harm. They caused more damage than any other species introduced to the continent. They ate native plant species 【小题5】 they disappeared. They competed for food and shelter with native animals. they caused the extinction or endangerment of numerous plant and animal species. And they were a nightmare for cattle and sheep farmers, 【小题6】 animals couldn't get enough grass to eat and starved.

The rabbits did some good, of course. They provided food for poor families. They supported fur industries. But their impact on the environment and major livestock economy was too negative 【小题7】(ignore). People tried trapping them. They even built a huge wall against them. But 【小题8】(effective) weapon was a virus.

【小题9】(test) multiple times, the deadly myxoma virus was released on Australia's rabbits in 1950. The virus had been developed very carefully to affect only rabbits. Nearly 100 percent of the rabbits who caught the disease   【小题10】(die).Populations fell. It was a huge success. Cattle and sheep farming recovered gradually, and threatened plants were better protected. Eventually, rabbits became resistant to the virus.