Foreign object damage of the aircraft and saving the lives of the 18 crew. The remains of 77 birds were found on or near the runway. On January 15, 2009, US Airways Flight 1549 flew into a flock of Canada geese and suffered a double engine failure. The pilot ditched the aircraft in the Hudson River, saving the lives of all on board. People working near aircraft have been sucked into jet engines. Some have died from their injuries. Significant problems occur with airports where the grounds were or have become nesting areas for birds. While fences can prevent a moose or deer
Flock (birds) success rate when attacking the flock, rather than increasing the ability of the flock to spot an approaching predator. By birds co-existing with one another in a flock, less time and energy is spent searching for predators. This mutual protection of one another within the flock is one of the benefits to living within a group. However, as flock numbers increase the more aggressive individuals within the flock become towards one another. This is one of the costs to living within a flock. It is often seen that flocks are dynamic and thus fluctuate in size depending on the needs