conservationist – n. someone who works to protect animals, plants, and natural resources or to prevent the loss or waste of natural resources; a person who is involved in conservation

cross-breed – v. to make two different kinds of animal produce offspring

extinct/extinction – n. the state or situation that results when something (such as a plant or animal species) has died out completely

surrogate – n. a person or thing that takes the place or performs the duties of someone or something else

Are animals where you live threatened with extinction? What do you think about the work of the conservationists who are trying to save the northern white rhino? We want to hear from you. Write a message in the comments section.