Index for 4aABa

• 4aABa1. Vocal tract length and formant frequency dispersion correlate with body size in rhesus macaques.
• 4aABa2. Whistle matching in wild bottlenose dolphins.
• 4aABa3. First audiogram for marine mammals in the open ocean and at depth: Hearing and whistling by two white whales down to 30 atmospheres.