Lotsa lotsa bebes (except for one, hehe)
Drawing detailed feathers of owls is unfortunately not part of my skill as an artist, and
for a project's sake that I have pulled up for Kathryn Lasky (as a gift, psst!);
I found a fun way to instead make the owls' looks as simple in my way. There are some characters who aren't actually from the series but will appear to say a few words around the main stars of GoG.

From the Tytonidae family are:
Soren, Kludd, Eglantine: regular barn owl
Hollyhock: lesser sooty owl*
Lou: oriental bay owl*

And from the Strigidae family are:
Gylfie: elf owl
Digger: burrowing owl
47-2: western screech owl
85-2: snowy owl
17-3 / Cunny: burrowing owl<
12-3 / Hortense: northern spotted owl
Zip & Zap: northern pygmy owl twins*
Silver: great gray owl*

*- made up characters by me
< - in the books, Cunny was mentioned to be Digger's brother, but never appeared as he was snatched long time ago. So I made the decision to include him on the row.

Guardians of Ga'Hoole belongs to Kathryn Lasky