It didn't sink in when I took this photo that this is obviously the second juvenile Burrowing Owl in the Conservatory at the Calgary Zoo. Their posture always makes me smile! I didn't notice till I got home and looked at my photos that the juveniles have white eyes, not yellow like the adults. This photo was taken through a glass/plastic wall that was dirty and really prevents a good image being taken. These Owls are free to fly around the Conservatory cactus area, so there is nothing between them and you.

"Juveniles can give a rattlesnake like buzz when threatened. This fools preadators into thinking that there is something a lot more dangerous than an owlet in the burrow." From www.whozoo.org.