Scientists spend a long time observing, studying and counting animals. When a species is in danger of becoming too rare, scientists remind everyone to protect it. What causes wildlife to become endangered? , the reasons of the species itself. Such as species specialization ② and genetic exhaustion. , habitat loss or destruction. Deforestation, land reclamation from lakes and seas, and overgrazing by humans for economic development have directly caused the loss or destruction of animal habitats and indirectly led to the endangerment of animals. , Indiscriminate hunting. The delicacy of snake meat and frog legs, the beautiful songs and beautiful appearance of wild birds, and the international black market for Tibetan antelope cashmere have all brought disaster to the above-mentioned animals. environmental pollution. Due to the widespread use of pesticides, rodenticides, chemical fertilizers, coal, and petroleum, a large amount of industrial "three wastes" and toxic substances have been produced, seriously polluting the environment, damaging the health of wild animals, and reducing their reproductive capacity. natural disasters. For example, the rare floods in the Yangtze River Basin in 1998 wiped out many wild animals that inhabited plains or hilly areas. How to protect endangered animals? Establish nature reserves. Such as establishing nature reserves for wild ass, bison, Asian elephant, white-lipped deer, takin, red deer, golden monkey, great bustard and other animals. ○ Carry out domestication and breeding. Such as establishing deer farms, bear farms, monkey farms, snake farms, bird farms, etc. There are many accompanying problems. The most notorious of these is the cane toad, which was introduced to northern Australia in 1935 with the intention of controlling the beetle population in sugar cane plantations. But here's the thing: The toads jump too low to eat the beetles that live on top of the cane stalks. Instead, glands in the cane toad's skin produce a highly toxic venom that kills would-be predators and rapidly expands the population. Millions of cane toads now threaten native species across Australia. Through this study, scientists believe that cane toads may have contributed to the decline of the northern quoll, a marsupial predator that preys on the toads.