Biologists do this as well. Once we encounter a new species, it's killed and then studied. This is called a 'voucher specimen'. Obviously it's possible to make

Biologists do this as well. Once we encounter a new species, it's killed and then studied. This is called a 'voucher specimen'. Obviously it's possible to make a species extinct if you kill the only one of it's kind, and the necessity of voucher specimens is a topic of debate amongst field biologists.