Dolphin Echolocation: How Ultrasound Enables Underwater Navigation

Dolphins use ultrasound for echolocation, communication, and sensing.

1. Echolocation: High-frequency clicks from the melon (acoustic lens) create mental maps of surroundings.
2. Sound generation/reception: Clicks >100 kHz from air sacs near blowhole; received via lower jaw/inner ears.
3. Echo interpretation: Analyzing returns reveals object size, shape, distance, texture—crucial for navigation, hunting, predator avoidance.
4. Communication: Click sequences, whistles, pulsed sounds convey danger, mating, group coordination over long distances.
5. Behavioral links: Rapid clicks for exploration, long whistles for mating/aggression, distinct patterns for hunting.
6. Marine advantage: Sound travels faster/farther in water, making ultrasound ideal underwater.
7. Species variation: Bottlenose dolphins have broader ultrasonic ranges and complex patterns.

Ultrasound is central to dolphin survival and social interaction.