Humans are not the only ones who underwent self-domestication. So did our close relatives, the bonobos, and the species we call our best friend. A tiny proportion of the genome differentiates dogs from wolves, and yet millions of dogs are comfortably curled up in our homes, while wolves move around at the edge of extinction.

When our research group began its work almost 20 years ago, we discovered that dogs also have extraordinary intelligence: they can read our gestures better than any other species. Wolves, in contrast, are mysterious and unpredictable. Their home is the wilderness, and that wilderness is shrinking.

But not so long ago the evolutionary race between dogs and wolves was so close, it was unclear who would win. Dogs, in fact, did not descend from wolves. Instead, dogs and wolves shared a wolflike ancestor.

Folklore supposes that humans brought wolf puppies into camp and domesticated them. Or as wolf expert David Mech wrote in 1974, “Evidently early humans tamed wolves and domesticated them, eventually selectively breeding them and finally developing the domestic dog from them.” But this story has not held up. Taming an animal occurs during its lifetime. Domestication happens over generations and involves changes to the genome.

So how did wolves turn into dogs? Back in the Ice Age, as our human populations grew more sedentary, we probably created more rubbish, which we then dumped outside our camps. These leavings would have included tempting pieces of food for hungry wolves. Not every wolf would have been able to scavenge, however. These animals would have had to be unafraid of humans, and if they displayed any aggression toward us, they would have been killed. After generations of selection for friendliness without intentional selection by humans, this special population of wolves would have begun to take on a different appearance. Coat color, ears, tails: all probably started to change.

Animals that could respond to our gestures and voices would be extremely useful as hunting partners and guards. They would have been valuable as well for their warmth and companionship, and slowly we would have allowed them to move from outside our camps to our firesides. We did not domesticate dogs. The friendliest wolves domesticated themselves.

Often, research surrounding non-native — also referred to as invasive (入侵的) — species focuses on the negative impact on the environments they invade. Non-native species represent threats or even disasters; some are even famous for it. But according to a new study from Brown University, while the negative aspects of non-native life, including the increased risk of causing extinction to other species, are mainly talked about, the positives are not always addressed. Researchers say that non-native species also have the ability to increase biodiversity (生物多样性) within habitats.

As far as famously feared non-native species go, zebra mussels are high on the unwanted list. They originated in the waters of Eurasia and have grown to become a major issue in lakes and waterways across the Great Lakes, as well as in states such as Texas and California. In unnatural habitats, they reproduce rapidly, outcompeting native species for resources. Additionally, they attach themselves to hard surfaces, such as pipes and boats, costing millions to remove.

But for its research, the team decided to focus not only on non-native species’ negative impacts but also on what they can contribute to habitats. In forests, the earthworms have the ability to change the ecosystem negatively. However, when earthworms are present in agricultural land, there is a possibility for a 25-percent increase in the productivity of agricultural crops. As far as brown trout — a non-native species in New Zealand — are concerned, locals have embraced the fish, enjoying the economic and recreational benefits of fishing for the species and adding it to their local food.

Biologist Dov Sax, along with co-authors of the Brown University study, says that these benefits are not as uncommon as past research on invasive species may suggest.

“Our new paper argues that the positive impacts of non-native species are neither unexpected nor rare but instead common and important,” says Sax.

A Beijing-based gene firm on Monday announced the world’s first cloned wild arctic wolf, which is listed as endangered in the Red List of Threatened Species by the International Union for Conservation of Nature, or the IUCN. Experts said its birth pioneers the breeding of more rare and endangered animals through cloning technology.

“We started the research cooperation with Harbin Polarland on cloning the arctic wolf in 2020. After two years of painstaking efforts, the arctic wolf was cloned successfully. It is the first case of its kind in the world,” Mi Jidong, the company’s general manager of the Beijing-based Sinogene Biotechnology Co said at a press conference in Beijing.

The birth of the world’s first cloned wild arctic wolf is a milestone for the application of cloning technology, which is of great significance to the conservation of rare and endangered animals and biodiversity, experts believe.

He Zhengming, the head of Chinese Experimental Animal Resources Research Institute for Food and Drug Control said that the cloned animals still have the ability to reproduce if they have intact fertilized eggs (受精卵). The cloning technology can copy all genetic information for selective reproduction.

From the world’s first mammal clone “Dolly”, cloning technology has provided the possibility to diversify the populations of some species such as cattle, pigs and horses. When endangered species in some places are identified, cloning of cells preserved from freezing technologies could also generate new life, experts said.

As part of a more concrete step to boost the breeding of more rare and endangered animals through cloning technology, the Sinogene Biotechnology Co and Beijing Wildlife Park built a partnership on gene seed preservation cloning technology applications in rare and endangered wild animals. Enhanced efforts for the protection of endangered wildlife species and their habitats are part of the goals of the country’s national development plan for the 14th Five-Year Plan period (2021-25), according to the National Forestry and Grassland Administration.