Vol 1, Issue 4, November 2014

• Cover Page
• Inside Pages
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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 Briseño Jaramillo, Martin Böye, 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 Würbel
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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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