owls watch out for their young, are wise and usually portrayed as old!!! i think pharah would be more of an eagle or hawk like the ancient egyptian gods.
because owls can throw biotic grenade, snipe from far away place, can heal other owls and most of all... can inject your butt with heavy dosage of energy drink
It's because Owls are wise and look after their younglings. Ana runs around looking out for everyone. Pharah is more a run and gun (fly and rocket doesn't run off the tongue as well) shed more suit an agressive bird.