clipped from: lakotahope.blogspot.com   
We have identified the culprits and now we need to do some more data crunching to figure out how to use this information. Canadian geese brought down an American commercial airliner on January 15, 2009. A flagrant disregard for in flight navigation and ATC instructions for safety in the Terminal area. The geese,two female and one male,were cruising at approximately 2,900 feet when their flight was disrupted by the two engines of the Airbus 320. According to Smithsonian institution scientists, these geese were the vagabond, transient type of goose. Not the local population that inhabit the flight path around the Hudson River. I am so happy this incursion did not involve the local goose

The determination that the birds were the 8-pound variety and not the 4-pound Brant geese is likely to comfort jet engine designers, since the engines are designed to survive strikes from 4-pound birds.....cnn.com

Canada geese (Branta canadensis) are "essentially flying cows," Marra said