: This study analyzes the structural differences in individual recognition signals, finding that species with mobile chicks (crèche-forming) have more complex acoustic individuality coding than those whose chicks remain in the nest. Acoustic Meaning of Seagull Calls
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: A technical paper identifying that seagulls have a range of heightened auditory sensitivity between 1 and 3 kHz , which matches the primary bandwidth of vocalizations in young gulls.