Every summer, the Serengeti plains (平原) of Africa are worth visiting. Millions of wild animals begin their 1,800-mile journey northwards on their annual migratory (迁移的) route.

In the month of November, polar bears in their thousands cross the Canadian Arctic, as they head towards the ice sheets of Hudson Bay. The sea ice that forms every winter is the key to the bear’s managing to exist, for here they hunt for seals (海豹).

The Great Bustard, one of the heaviest flying birds, migrates each year across Europe and Asia to its wintering grounds. Unluckily, these and other migratory animals are in danger from human activity.

We have written several articles on climate change and the effect of rising ocean temperatures. Since 1979, ice sheets in the Arctic have gone down by 30 percent. What does this mean for polar bears? They are forced to stay on land for longer periods of time, which delays their search for food. As a result, bears today are 60 pounds lighter than what they were. Besides, smaller bears also produce weaker babies, and their chances of survival are at risk. In the plains of Africa, migratory animals like gazelles are traveling long distances for food, just to avoid falling prey (牺牲品) to humans who hunt them.

In an unusual step, experts from 120 countries have agreed to protect 31 migratory mammals, fish and birds. The United Nation’s 11th annual Conservation of Migratory Species of Wild Animals (CMS) was held in Quito, Ecuador. For the first time, 900 experts attended the conference, and the enthusiastic support shows the world is united in conservation (保护) efforts.

What does getting on a protected list mean? Countries that have signed the agreement will be required to pass laws locally and work with other countries that fall within the animal’s migratory path. Only one animal did not make the list. The African lion was rejected (拒绝) for lack of information of the countries where it lives.

With the help of modern technology, people have killed up to 99 percent of certain types of whales. Some scientists thought this would cause krill (磷虾), tiny shrimp-like animals that many whales eat, to explode in number. But that didn’t happen. Krill numbers in Antarctic waters with of whale hunting have dropped by more than 80 percent. New research suggests a lack of whale poop (粪便) may explain this. A new study finds whales eat more than we thought. Lots more food means lots more poop that is rich in iron. So with fewer whales, ecosystems get less iron and other crucial nutrients that they need to thrive. That hurts other species, including krill.

Figuring out whale diets isn’t easy. In the past, scientists looked at the contents of dead whales’ stomachs to see what they ate. Or they estimated how much food whales should need based on their size. However, the new study, led by Matthew Savoca, a marine biologist at Stanford University, used some different techniques. Savoca’s team put sensors on 321 whales. The sensors tracked when the whales hunted for food.

Using all this information, the scientists found that whales eat about three times as much food as earlier estimates had suggested. The amount of food that whales eat and poop out is astonishing. And it suggests that whales play a bigger role in shaping ocean ecosystems than previously thought.

Whales are nutrient cyclers. If whales and krill returned to their early 1900s numbers, the productivity of the Southern Ocean could be boosted by 11 percent, the researchers calculate. That increased productivity would translate into more carbon-rich life. Together, those creatures would store 215 million tons of carbon each year. The carbon stored in those creatures wouldn’t be able to escape into the atmosphere and contribute to global warming.

Joy Adamson (Jan, 20, 1910-Jan. 3, 1980) was a popular wildlife conservationist of the 1960s and an author, best known for her book, Born Free, which described her experiences in saving the life of a lioness, Elsa.

Mrs. Adamson was born as Friedericke Victoria Gessner in Troppau. Silesia, Austria-Hungary (now Opava, Czech Republic). In 1937 she moved to Kenya. then a British Colony. In 1944 she married George Adamson, a British game warden in Kenya. and adopted Kenya as her own country, living on the shores of Lake Naivasha. It was with George Adamson, her third husband, that her most crucial and well-known work was done. Their works were pivotal (关键的)for the foundation of modern conservation.

They acquired Elsa, a tame lion cub, in 1956, after George had killed the cub's mother in self-defense. For two years Joy and George trained the animal for a return to the wild, and the subsequent book about Elsa. Born Free (1960), was an international success. Adamson followed the book with Living Free (1961) and Forever Free (1962). These first two books were made into films. In addition to her books about lions, Adamson also wrote two books about Pippa. a cheetah (猎豹) she took on in 1964. as well as numerous other books about her life in Africa. She was also an accomplished artist and many of her paintings are displayed in a museum in Nairobi, Kenya.

Joy and George separated in the 1970s, though they never divorced. On January 3, 1980, Joy was found murdered in a remote region of Kenyn. George was murdered on August 20, 1989, in an isolated region of Nairobi. This was an ironic (讽刺的) end to the lives of two who had lived in such seemingly dangerous circumstances with wild animals; that their deaths were at, the hands of men.