Without zoos you might as well tell these animals to get stuffed.

如果没有动物园的话, 还不如把这些动物都做成填充标本.
Because of the care and feedings these animals receive in the zoos, they continue to live and thrive, but if they don't live in the zoos, they will not survive the environment because of the poachers. Therefore, it would be better for them to be used for taxidermy (after the animals die, people will prepare, stuff and mount the skins of these animals in lifelike form for display动物标本剥制术).

Get stuffed: to be used for taxidermy 动物标本剥制术