A prickle of porcupines, an exhaltation of larks, an acne of adolescents, a tough of lesbians, a scolding of seamstresses. With owls you can have a stare, a wisdom or even a sagaciousness but the old favourite has to be a parliament of owls. These are just little baby owls, just woken up.
Also, these owlets have been made from recycled fingerless glove seconds- a parliament of owls made from an elicat of gloves!
(I have to admit I love Wikipedia for that intant middle of the night encyclopaedia fix. Try it for their list of collective nouns, it's a hoot- sorry.)