I am currently clearing the level 26 of the forest, and since winter started (i'm not too sure about that) I have trouble to catch prey : I usually pick only one wolf to not decrease the food too fast. Normally when I found a prey I could go on another tile the time I pick my battle wolves, and when I get back, I hunt.
But now the prey's picture don't appears on the tile anymore and if I go to another tile and then go back on it even without changing wolves, the prey simply disappeared...

Is it related to winter, the level of the territory or is a bug ?

Its because during winter, you only get one chance to get to hunt that creature.

Okay, thanks