世界上最后一头雄性北方白犀牛死亡

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conservancy - n. an organization that works to protect animals, plants, and natural resources especially by purchasing and caring for areas of land

app - n. a computer program that performs a special function

eligible - adj. able to be chosen for something

bachelor - n. a man who is not married

implant - v. to place (something) in a person's body by means of surgery

poacher - n. someone who catches or kills animals illegally