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Are California Sea Lions (Zalophus californianus) Sensitive to the Attentional State of their Caretakers?

Marie Penel and Fabienne Delfour

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Let's Talk about Citizen Science: What Doesn't Work

Allison B. Kaufman

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Behavioral Correlates of 50-kHz Ultrasonic Vocalizations in Rats: Progressive Operant Discrimination Learning Reduces Frequency Modulation and Increases Overall Amplitude

Shoko Yuki and Kazuo Okanoya

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Nocturnal Vocal Activity in Captive Bottlenose Dolphins (Tursiops truncatus): Could Dolphins have Presleep Choruses?

Dorothee Kremers, Margarita BriseÃ±o Jaramillo, Martin BÃ¶ye, Alban Lemasson, and Martine Hausberger

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Unrewarded Object Combinations in Captive Parrots

Alice Marie Isabel Auersperg, Natalie Oswald, Markus Domanegg, Gyula Koppany Gajdon, and Thomas Bugnyar

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Play in Rats: Association across Contexts and Types, and Analysis of Structure

Luca Melotti, Jeremy D. Bailoo, Eimear Murphy, Oliver Burman, and Hanno WÃ¼rbel

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Classification of Captive North American River Otters (Lontra canadensis) Vocal Repertoires: Individual Variations, and Age Class Comparisons

Carla Almonte

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