The Lib Dems have declared in recent weeks that scrapping the 50p rate is "cloud cuckoo land" (that was Chief Secretary to the Treasury Danny Alexander) and "impossible" (Vince Cable).

BBC: The UK's 50p rate: Tax or symbol?

He aimed to gather the highest number of eggs from a single cuckoo in one season, Mike Birkhead Associates said.

BBC: Birdwatcher gave 1922 cuckoo clue

Completely, he's living on cloud cuckoo land if he thinks that's a sustainable solution to the crisis.

BBC: Nick Clegg interview

Those participating will also be given materials to help identify at-risk species such as the small-spotted catshark, the starry smoothhound shark and the cuckoo ray.

BBC: Shark identification training for fishermen