McCormick Place in Chicago, the largest convention center (会议中心) in North America, is covered in glass that is enjoyable for humans but deadly for birds. On Oct 5, over 1,000 migrating birds died from colliding with (相撞) its glass walls in a single day.

According to data from Cornell University, the number of birds killed there during that one night is roughly equal to the typical yearly bird collision deaths at the building.

One key reason for the accident is the glass. During the day, birds fly toward glass as it reflects a perfect image of the sky and nearby trees. As night falls, the bright light from glass buildings attracts birds who fly according to the location of the moon and stars. The recent collision happened on the night of Oct 5, when the lights in the building were on for an event.

After colliding with a building, many birds will die on the spot from a broken skull. Others may continue to fly for some distance, but they rarely survive for more than a few hours, as Brendon Samuels, who researches bird window collisions at the University of Western Ontario, Canada, told The Guardian.

Every year, nearly one billion birds collide with glass in the US, according to the US Fish and Wildlife Service. In China, bird collisions are not uncommon, either. In the autumn of 2022 and spring of 2023, the National Anti-bird Collisions Action Alliance reported a total of 190 cases of bird collisions, which included several types of birds listed as second-class protected wildlife.

These tragedies (悲剧) could have been avoided if appropriate (合适的) measures had been taken. Many places around the world have already put forward bird-related guidelines on building design. These include reducing the use of glass in building walls and applying bird-friendly materials and visual markers (视觉标记) to the buildings’ walls. Turning off lights at night during migration seasons can also significantly help reduce bird collisions.

Alongside guidelines on bird-friendly building design, people can also do their bit to help birds by putting stickers (贴纸) on glass windows in their homes and closing the curtains at night.

A few years ago. four female mountain gorillas （大猩猩）left home, abandoning not only their mate — a sick alpha silverback — but their infants （幼崽），which were barely old enough to Iced themselves. Most mammals abandoned by their mothers risk an early death, and researchers worried about the young gorillas.

Instead, the scientists got a heartwarming surprise. The young gorillas’ uncle, a male gorilla named Kubaha, began to take care of them. He let them sleep in his nest and climb all over him like a jungle gym.

Kubaha’s willingness to be a foster dad turns out to be surprisingly common in mountain gorillas. An analysis on mountain gorillas at the Gorilla Fund's Karisoke Research Center in Rwanda has revealed that when young mountain gorillas lose their mothers, they do not have a greater risk of dying or losing their place in the social hierarchy because the rest of the group buffers them from the loss. The social group has evolved to protect the infants from the ill effects of losing their mothers.

The researchers confirmed this assumption by focusing on data on 59 gorillas between the ages of 2 and 8 who lost their mothers or were orphaned （成为孤儿）before they were fully mature. They then compared the survival of these animals across their lifetimes with the survival of 139 nonorphaned gorillas. They also compared their reproductive success and social rank as adults — and tracked who the infants spent the most time with.

Not only were the orphaned and motherless gorillas at no greater risk of dying, they also suffered no long-term effect on their ability to reproduce or on their social rank, the team reports today in eLife.

The findings suggest such altruistic behavior is not unique to humans — and that dads play an important role in primate youngsters' lives, says Duke behavioral ecologist Susan Alberts, "Nonhuman primates often are really good dads," she says. 'This shows that paternal care goes very deep in our primate lineage."

The panda is one of the animals most in danger. There are about 2，000 pandas living in the forests today. Zoos and research centers look after about 300 pandas. Scientists are studying how they live and more baby pandas are born in the zoos.

Pandas live in the forests and mountains of Southwest China. They mainly live on bamboo, and each panda needs to eat a lot of bamboo every day. The area of bamboo is becoming smaller for many different reasons, so pandas have less and less land to live on. Pandas don’t have many babies, and baby pandas often die. The situation is becoming very serious.

Our government is working hard to save pandas. There are more than 30 nature reserves to protect pandas but these are not enough. The government has made a new plan to help pandas. The nature reserves will be bigger and the bamboo will grow better. Then the pandas will have enough food to eat and enough places to live in. Pandas born in the zoos may go back to live in the nature reserves.

Most people love pandas. The panda is one of the best­known animals in the world. It is the symbol of the World Wide Fund for Nature. The WWF works to protect all animals in danger, so the panda has become the symbol of all animals in danger. There is still a long way to go to save the panda. Think of other animals in danger such as tigers, whales, turtles and elephants—we need to save the panda, and we need to save them, too.