Editing this video of a Embraer Belavia in ALC airport, I noticed what appear the remains of a bird behind a engine. Although not seen in the video how he got there, what is seen is how the plane seems to be thoroughly reviewed before takeoff, so it was not already joined, I guess it hit when the plane start the race and been hooked on that part of the plane and then discard.
Fortunately without consequences for the plane
Fortunately without consequences for the plane