TAIL STRIKE ON TAKEOFF

A tail strike is deemed to have occurred when the tail of an aircraft touches the runway during takeoff or landing. Long aircraft are more prone to this and this would result in significant structural damage to the aircraft and jeopardise the safety of the flight.Statistically, there are more tail strikes during landing than at takeoff.(Airbus)

BIRD STRIKE AVOIDANCE DURING TAKEOFF AND FINAL APPROACH PHASE

The Federal Aviation Administration estimates the bird strike problem costs US aviation 400 million dollars annually and has resulted in over 219 worldwide deaths since 1988. In the United Kingdom, the Central Science Laboratory estimates that, worldwide, the cost of birdstrikes to airlines is around US$1.2 billion annually. This cost includes direct repair cost and lost revenue opportunities while the damaged aircraft is out of service.(Wikipedia)