Different environments cœxist along this route: spruce, alder, mixed forest with deciduous trees. Thus, the guild of tits presents a complete spectrum of species such as the great tit (the biggest), the coal tit, the European crested tit or the slender long-tailed tit. It often happens that during the winter, all these species gather together in large flocks (several dozen birds) to protect themselves better from their winged predators (Eurasian pygmy owl or Eurasian Sparrowhawk).