This is a video of a territorial dispute between male woodlarks.
From the BBC:
Endangered bird ‘makes comeback’
The woodlark, one of England’s most critically endangered birds, is making a dramatic comeback, the RSPB has said.
In the last 10 years, numbers have almost doubled from 1,633 breeding pairs in the UK in 1997 to 3,084 pairs, according to the charity’s survey.
But conservationists fear woodlarks’ good fortune may be short-lived.
See also here.
Birds of Seahouses and Farne Islands: here.