Rigify ultilites. Need advise

Can rigify be use to rig quadruped and biped like bird? Can it be use with all sort of character animation or should i learn the entire rigging process for character animation?

Well for what its worth i tried to rig a dino using rigify but couldnt work out how to add an other toe that would work with heel. You can add stuff but it may not work with all the constraints. This is just my experience though.