A simple multi-cache. You will find all necessary information on the board on the initial coordinates. I wonder if any of you wakes up so early ?
And how to get the coordinates ? It's very simple. You have to change everything into minutes (so, for example 5:15 is 315) and count:
N 52 18.[song thrush (drozd śpiewak) + robin (rudzik) + blackbird (kos) + pipit (świergotek) + cuckoo (kukułka) - chaffinch (zięba)]
E 20 55.[great tit (sikorka bogatka) - chiffchaff (pierwiosnek) + golden oriole (wilga) + starling (szpak)]