Spring in the Marsh

Some obeservations from a marsh land and a mire, where the animal and plant world are still more or less intact, and you still can watch birds and other animals that are rare or completely missing from agriculture areas nowadays.
Sound ist partly weird, that's work in progress at the moment :)
The list of species. At this point in time I haven't added the species names to the subtitles.
Lake frog (Pelophylax spec.) (audio only)
Mallard (Anas platyrhynchos)
Tree pipit (Anthus trivialis)
Common stonechat (Saxicola rubicola)
Sparrowhawk (Accipiter nisus) (akkustisch)
Dragonfly Anisoptera)
Greylag goose (Anser anser)
Cuckoo (Cuculus canorus)
Dovetail (Papilio machaon)
Savi's warbler (Locustella luscinioides)
Sedge warbler (Acrocephalus schoenobaenus)
Reed bunting (Emberiza schoeniclus)
Beaver (Castor fiber)
White Wagtail (Motacilla alba)
Great crested grebe (Podiceps cristatus)