The Mystery of the Bio-Duck Quack

What was the frequency range of the mysterious quacking sound heard in the Southern Ocean?

• 200 to 300 Hertz

• 150 to 200 Hertz

• 60 to 100 Hertz

• 10 to 50 Hertz

During which season was the quacking sound primarily heard in the Southern Ocean?

• Spring

• Summer

• Autumn

• Winter

What was one of the speculated sources of the quacking sound before it was identified?

• Sunken ships

• Aliens

• Deep-sea vents

• Underwater volcanoes

Which animal was eventually identified as the source of the quacking sound?

• Dolphin

• Mink whale

• Giant squid

• Blue whale

What potential purpose of the quacking sound made by mink whales is still uncertain?

• Mating

• Communication with other species

• Hunting

• Navigation