They are just insect defence signals, but these sounds scare humans

By Deborah Devis
October 1 2021 - 1:00pm
Larva of the Sawfly (Craesus septentrionalis). Picture: Shutterstock.
Larva of the Sawfly (Craesus septentrionalis). Picture: Shutterstock.

What's that sound? The aliens are coming! No, wait - it's only insect defence signals.

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