The results revealed that all the penguins have four essential vocalisations: a contact call emitted by isolated birds, an agonistic call used to signal aggression, an ecstatic display song uttered by single birds during the breeding season, and a mutual display song sung by pairs at
agonistic הגייה עם משמעויות, מילים נרדפות, הפכים, תרגומים, משפטים ועוד