V...I had to re-read your post....INSIDE the buildings? At many airports there are problems with deer getting on the runways. This deer rut season (mating) is really crazy this year.
Deer Gets Past O'Hare Security
Young Buck Enters Through Delivery Doors
POSTED: 6:29 am CST November 17, 2004
UPDATED: 7:59 am CST November 17, 2004
CHICAGO -- A deer was destroyed Tuesday after breaching security at O'Hare International Airport and ending up in Terminal 2.
Images: Deer At O'Hare Airport
The deer's head could be seen peeking through a window.
The young buck avoided security by tripping automatic doors typically used for deliveries. The Department of Aviation said the deer was looking for shelter after being injured on the road.
Airport workers cornered the deer near the Terminal 2 baggage claim area, and animal control officers hauled it away. Authorities tranquilized the deer and, after assessing its injuries, euthanized it.
http://www.nbc5.com/travelgetaways/3924995/detail.html