How swarming bats can use the collective soundscape for obstacle avoidance

Area of Science:

• Bioacoustics
• Animal Behavior
• Sensory Ecology

Background:

• Echolocating bats navigate complex acoustic environments.
• Dense bat swarms pose challenges for distinguishing self-echoes from others' calls.
• Spectral jamming is a proposed, but potentially ineffective, solution for dense swarms.

Purpose of the Study:

• To propose and test an alternative hypothesis for bat navigation in dense swarms.
• To investigate if bats use local amplitude gradients of the collective soundscape for navigation.
• To reframe the understanding of signal jamming in bat communication.

Main Methods:

• Developed an agent-based simulation of bats flying in confined spaces (corridors).
• Simulated bats navigating through obstacles, including walls and other simulated bats.
• Analyzed navigation success without requiring individual echo distinction.

Main Results:

• Simulated bats successfully avoided obstacles and other bats.
• Navigation was achieved by relying on the emergent acoustic environment.
• The study demonstrates passive exploitation of the collective soundscape for safe spacing.

Conclusions:

• Bats in dense swarms may navigate using the local amplitude gradient of the collective soundscape.
• Overlapping bat calls can provide useful navigational information, not just interference.
• This reframes acoustic interference as a form of cooperative signal processing.