I just caught these two back to back (~10m away one from the other) arround these coord 53.593944,10.017424 (Stadtpark in Hamburg)
The fact that one spawned with the beach background when it should spawn in forest, and the other has a forest background on a beach biome clearly shows that the OSM tags are not the same to identify biome and background (which is weird)
If someone checks the OSM tags arround here (I would but I genuinely don't know how), it might help identify the conditions that triggers the spawns (the Toedscool spawns almost everywhere in the park, but it's the only place I saw a Wiglett)
by Zelphyr151