M62 Woodpigeon

Coming back from Manchester yesterday evening up the M62 from Milnrow to Jct 22 we 'locked on' to a Woodpigeon on the same flight path! We trailed it for about 1 & half to 2 miles (it was about 30 to 40 ft up - it was doing the same speed as us - 70mph. We came off at Jct 22 and the Woodpigeon looked to be carrying on towards Ainley Top......I know they are strong fliers but 70 mph - wonder how long it could keep that pace up?