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- [3] A CASE OF HYPERMALIA IN A MALLARD (ANAS-PLATYRHYNCHOS L) ZEITSCHRIFT FUR JAGDWISSENSCHAFT, 1980, 26 (04): : 233 - 236
- [8] SIBLING INTERACTIONS IN MALLARD DUCKLINGS (ANAS-PLATYRHYNCHOS) BEHAVIOUR ANALYSIS LETTERS, 1982, 2 (04): : 189 - 196