Another bout of snow for the UK, but head south by a few thousand miles and it's warmer than usual, so birds have been migrating north from Southern Europe and Africa earlier than usual. The linked article mentions this phenomenon in its last couple of paragraphs.

It also states that Bitterns are calling ('booming') for mates and Willow warblers are warbling – both months early. As far as I'm aware Bitterns don't migrate north to the UK for the summer so I don't quite understand that link, or why they reckon that snow means it's April. If you see one be sure to ask it.