Finding fish is going to get harder as climate change continues to heat the world’s oceans. A new study finds that warming seas over the past 80 years have reduced the sustainable(可持续) catch of 124 species(物种) of fish and shellfish.

Overfishing（过渡捕捞) has made that decline worse, researchers say. In some parts of the world, such as the heavily fished Sea of Japan, the decrease is as high as 35 percent. That’s a loss of more than one in every three fish.

Researchers examined changes in 235 populations of fish and shellfish between 1930 and 2010. On average, that warming has caused the sustainable catch to drop by 4.1 percent, the study found. About 8 percent of the fish and shellfish populations the team studied saw losses as a result of the ocean warming. However, about 4 percent of some populations increased. That’s because certain species have thrived in warmer waters. One example is a kind of black sea fish. It lives along the northeastern U.S. coast. As warming continues, these fish will reproduce faster until they reach their limit.

About 3.2 billion people worldwide rely on seafood as a source of food. That means it’s urgent for commercial fishing fleets and regulators to consider how climate change is affecting the health of all of those fish in the sea.

File it under strange things cats do! Last month, a post made thousands of people do some rather strange behavior themselves: taping a square on the floor and seeing if their cat would sit in it. Evidently, a lot of feline (猫科的) friends ended up sitting in these pretend boxes their people made, according to the Washington Post. But why? Why do cats love boxes — even outlines (轮期) of boxes?

Well, why do cats do anything they do? People have been trying to figure that out for the past 4,000 years. Feline behavioral scientists say that cats love boxes because seeking out confined (封闭的) spaces is the nature of the larger species from which the domesticated (被驯养的) cats evolved. Out in the wild, confined spaces allow felines to protect themselves and track their prey (捕食物) according to Live Science. A study out of Utrecht University in the Netherlands showed that hiding in boxes significantly reduces cats’ stress levels and can even make them more willing to interact with humans overall. Another study suggests that they are drawn to boxes because they are more comfortable at a higher temperature than most of us keep our homes. Thus, the box provides them with a way to stay warm.

One Reddit user guessed that the ancient Egyptians kept what we now know as the domesticated cat having a natural preference for sitting in boxes because it helped to keep their pets from wandering. “By the hundredth generation or so, even the outline of a box was enough.…. and that habit is still present in them to this day.” This needs more scientific evidence. But it could help to explain why a cat would be drawn to a tape-on-the-floor box.

Recently, Australian scientists learned something unexpected about magpies(喜鹊)when they tried to attach trackers to them to learn more about their habits.

The birds the scientists hoped to study were Australian magpies. They’re medium-sized black and white birds from the same bird “family” as crows(乌鸦). They live in groups of up to 12 birds and work together to defend the area they live in.

The researchers were eager to try a new tracker on the magpies. They hoped to learn more about how far the birds flew and what they did during a normal day. The scientists are concerned that magpies may have a hard time adjusting as the world warms up because of climate change.

To keep the trackers on the birds without causing flying problems, the researchers developed a special harness (背带). It was tough, so it wouldn’t come off by accident. But it had a special release controlled by magnets (磁铁). This was meant to allow the scientists to free the birds from the harnesses at a special magnetic bird feeder, without having to catch the birds again.

The researchers placed trackers on five magpies using their special harnesses. But just ten minutes after setting up the last magpie, they noticed something unusual: an adult female magpie was helping another magpie get free from its harness. In a few hours, most of the other magpies had also been freed from their harnesses. By the third day, none of the birds had trackers anymore.

The scientists were disappointed about the trackers, but they realized that the magpies had taught them something else: magpies are able and willing to help each other out. This is called “rescue behavior”, and it’s not that common in the animal world, especially among birds.