Poachers have killed some of last northern white rhino, leaving less than 25 of the beasts left on the planet.
A big meeting is being held at London Zoo on Thursday to decide how the last of this species can be protected.
All the northern white rhino live in Garamba National Park, in Africa. This type of rhino is in the top 12 most endangered animals in the world.
They're under threat because poachers kill them for their horn which is made into expensive dagger handles.
These daggers are highly prized in some countries.