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  • of assessing these habitats is described which is based on computing the ressources available on the main types of feeding grounds (from mud-samples) and the prey found in the oesophagus of five species of ducks (Mallard, Pintail, Teal, Garganey and Shoveler
  • at night to exploit feeding grounds which are exclusive to the group and return to the same roost the following day at dawn. The strong social organisation of teal leads to the division of the population into several groups, each one exploiting exclusively