Don't mess with my territory. Male northern parulas sing and get physically aggressive when intruders invade their space.

Each spring, birds across America are in full voice. Cardinals chatter, sparrows sing and warblers warble. Birdsong lifts the human spirit – “‘Hope’ is the thing with feathers,” after all. Yet birds are not singing to soothe our nerves after a stressful day at the office. Instead, they sing to defend their territories and attract mates.

The traditional view of birdsong focuses on the male bird: He is like a gladiator who fiercely defends his territory against rivals to ensure sufficient space and resources to feed and raise his chicks.

Originally published on theconversation.com, part of the BLOX Digital Content Exchange.

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