Willow Warbler

"Willow Warbler Phylloscopus trochilus" by Andreas Trepte - Own work. Licensed under CC BY-SA 2.5 via Wikimedia Commons

The willow warbler, Phylloscopus trochilus, had to be today's species after yesterday's chiffchaff. It is more impressive on account of its hardcore migration (all the way to sub-Saharan Africa) and prettier song. The latter is a delightful cascade of liquid notes.
Unfortunately their numbers have fallen massively over the last few decades. The reasons are not entirely clear but humans kill tens of thousands of migrating passerines every year in places like Cyprus and Malta.