Place your bets....

Purely for fun, any 'betting' on what the next totally new species for Calderdale might be? Bare in mind that there have been some bizarre ones over the centuries, so what you think of a a new bird might not be. If you had black guillemot in mind for example, it's gone!
My hat is in the ring for dartford warbler, as they are pushing north.

Any other suggestions?