Hey @jin8864y! So the old retarget manager has not been brought over to UE5, however there is the retarget sources area which does roughly the same thing. Unfortunately the documentation for that is still a work in progress! Since I’m not skilled on the tech art side, I’ll link a video that helped me retarget recently, however it’s going to be a bit more involved on the animals side, fair warning there. It looks like you might need to pose match them before you can use this method, which for animals might be a problem. Hopefully someone with more intimate knowledge of this system might have a better example! Hope this helps!
Disclaimer: this link is to an external tutorial by a member of the community not affiliated with Epic Games. This said, you are liable for anything that occurs beyond this Unreal Engine domain.