[fauigerzigerk]

If the economic benefits of protecting the giraffes outweigh the economic benefits of hunting them, then the resources for enforcement do exist. It's "just" a matter of distributing the benefits effectively.

There isn't just endless savannah. Poachers need local infrastructure, supplies, protection, etc. If locals can make a living from tourism and from protecting the animals, they will stop the poachers and/or stop being poachers.