Here's something cool from the Arkansas Game and Fish Commission...
"During spring 2004, Arkansas Game and Fish Commission biologists placed satellite transmitters on 28 mallards. These transmitters weigh only 30 grams (less than 10% of a duck's body weight), and are designed to fit as a backpack. They communicate with satellites in orbit around the earth to determine their locations. The ability to communicate with satellites also allows AGFC to collect data without recapturing the animal. The transmitter only becomes active for a short period of time every two to four days. During the active period it collects as many locations as possible within the pre-programmed time frame. The acquired locations are then sent to the AGFC, where the duck's progress is mapped using Geographical Information System (GIS)."
I've been watching this for a couple of weeks and it's a lot of fun seeing how the ducks are moving with the weather changes North of us!
Just click on the link below to read more about the program and enter your email address and zip code to view the Satellite map.