Some animals prey on domestic animals and can be dangerous to humans.
This consideration is important but can be resolved by the following solution:
Some animals (such as the gray wolf) have successfully been reintroduced to parts of their historic ranges.
Keeping animals in captivity is expensive and can require large amounts of space.
It may not be necessary to keep animals in captivity, and a good solution for that would be putting them on nature reserves and protected areas. So the solution would be:
Nature reserves and other protected areas preserve animals' and plants' habitats.
Humans use increasingly large amounts of land for agriculture, cities, roads, and mines.
Even if humans are using more and more space, we can also organize in a way in which humans can take care of animals that are endangered. So the solution would be:
Some animals (such as the California condor) have been captured and bred by humans to prevent extinction
