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This quiz is devoted to our flying (and sometimes flightless) feathered friends. Can you bring home a victory to feather your nest?

There are some giant things lurking in these questions. Some of them are easy to spot, and others are hidden. Can you uncover all the answers?

Double Helix magazine is looking for your questions! Our Microscope column answers the most intriguing science, tech, engineering and maths queries you can throw at us.

Welcome to Megafauna Monday, where we help you chase away the post-weekend blues by showcasing some of the mighty beasts that once roamed the planet. Today it’s about the biggest bird of them all!