What ever you put in with the lion better be bigger then his mouth or he will try to eat it to pork would be ok cause he can expand but the niger better be a bit larger just to make sure he stays a little bigger then the lions mouth.
what I hear is you do not want to put the porq in there,I've read of the porq will swim into the lion accidently during feeding ,in which the porq gets stung and dies..