Flight behaviour and short-distance homing by nomadic grey-headed flying-foxes: a pilot study

Area of Science:

• Animal behavior
• Navigation and spatial cognition
• Bat ecology

Background:

• Navigation is vital for flying animals' survival.
• Bat navigation is less understood than bird navigation.
• Arboreal roosting flying-fox navigation remains largely unknown.

Purpose of the Study:

• To investigate the navigational abilities of displaced grey-headed flying-foxes.
• To determine if flying-foxes are aware of their location relative to their roost.
• To analyze flight behavior metrics for insights into bat navigation.

Main Methods:

• GPS tracking of 11 displaced grey-headed flying-foxes (Pteropus poliocephalus).
• Displacement of 16.8 km from their home roost.
• Comparison with 7 non-displaced reference flying-foxes.

Main Results:

• Ten of 11 displaced flying-foxes returned to their roost within four days.
• Displaced individuals flew further and stopped more often before returning.
• Flight paths of displaced bats were higher, less straight, and less oriented initially.

Conclusions:

• About half of displaced flying-foxes showed immediate spatial awareness.
• Other individuals required an additional night to orient themselves.
• Findings support the hypothesis of a large-scale visual navigational map in non-echolocating bats.