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- [33] INFLUENCE OF SEPARATION ON PAIR BOND IN BUDGERIGARS (MELOPSITTACUS-UNDULATUS - AVES, PSITTACIDAE) ZEITSCHRIFT FUR TIERPSYCHOLOGIE-JOURNAL OF COMPARATIVE ETHOLOGY, 1976, 41 (04): : 396 - 408
- [38] SPEECH-PERCEPTION BY BUDGERIGARS (MELOPSITTACUS-UNDULATUS) - THE VOICED-VOICELESS DISTINCTION PERCEPTION & PSYCHOPHYSICS, 1989, 46 (01): : 65 - 71
- [40] RECOGNITION OF INDIVIDUAL NESTING BOX IN BUDGERIGARS, MELOPSITTACUS-UNDULATUS SHAW (AVES, PSITTACIDAE) ZEITSCHRIFT FUR TIERPSYCHOLOGIE-JOURNAL OF COMPARATIVE ETHOLOGY, 1976, 42 (01): : 1 - 11