Anser anser

tags: Greylag Goose, Anser anser, birds, mystery bird, bird ID quiz [Mystery bird] Greylag Goose, Anser anser, photographed at an RSPB reserve in Strumpshaw, Norfolk, UK. [I will identify this bird for you tomorrow] Image: Brian McFarlane, 2009. Please name at least one field mark that supports your identification. Here's a bit of a change of pace: The ID of this bird is easy, but can you tell me the proper term for what it is doing and explain why it is doing this? This bird is whiffling; flipping upside down to dump airspeed so it can land [read more about it]. Review all mystery…