(1 & 2, by Photomatt28 & barloventomagico)

"There are a number of things which separate the burrowing owl from other species. The first clue is in the name.  Another is that they are the smallest species of owl on the planet and more often or not they do not weigh more than half a pound and reach around ten inches in height. They also come out in the day time, unlike most other owls." (The Burrowing Owl: The Smallest Species of Owl)