01 · The Five Clues

Bird Size

How big is the bird?

Compare the bird with birds you already know.

Size Reference Chart

A quick visual key to bird sizes — use it together with the scale below.

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SmallerBigger

Where does it sit?

Search for a bird to see how its size compares with birds you already know.

Pick any bird above. We will place it beside the nearest smaller and bigger birds we know, using their recorded lengths.

Which one is bigger?

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