Sentences with Explanations in Biological Intruder

Since World War II, 9 species of native birds in Guam 1 1 have been wiped out by brown snakes, and the number of the remaining 2 species is decreasing day by day, which is in danger of extinction at any time.

For example:

For example, the US House of Representatives passed a bill in 1996, requiring relevant agencies to strengthen the monitoring of vehicles that may carry alien species. To this end, the US government is planning an inter-departmental monitoring plan.

Some foreign pets, such as snakes, lizards, bobcats, etc. Often escape from the fence due to the negligence or abandonment of the owner, and gather mountains to harm one side.

For example:

Many biologists and ecologists blame the increasing number of "biological invaders" on the increasingly prosperous international trade. In fact, many "biological intruders" achieve the purpose of "smuggling" by hitchhiking in transnational trade.