The ghosts soul directive before having a guardian is to first find said guardian. To be a guardian you must:
1) be dead before resurrection (obviously)
2) use the light to protect the traveler/city (this has be completely ignored in some cases though)
No where does it say you must be human, shown by there being exo and awoken guardians.
The has forever been the question [b]could a fallen or cabal or whatever become a guardian?[/b]
But this is not my question. My question is [u]could animals become gardians?[/u]
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In the lore, the fallen used to wield light and have the blessing of the traveler before oryx assaulted their world and the traveler fled to earth. It’s heavily implied that this isn’t the first time it’s done this either, so possibly hundreds of species have wielded light at some point.