Subscribe now

Puzzle #124: How many rings have thieving jackdaws got in their nests?

By Barry R. Clarke

28 July 2021

#124 Next-door jackdaws

New Scientist. Science news and long reads from expert journalists, covering developments in science, technology, health and the environment on the website and the magazine.

Four jackdaws, Aak, Bik, Crawk and Deek, all live close to the edge of Tree Cherry Plain. Each has a nest containing 10 silver rings that they have stolen from local houses.

However, being untrustworthy neighbours, they also like to pilfer from each other.

On Monday, Aak steals some rings (call the number K) from Crawk. On Tuesday, Crawk takes L from Bik. On Wednesday, Deek steals M from Crawk. On Thursday, Deek takes N from Bik. On Friday, Aak removes L from Deek. Finally, on Saturday, Bik flies off with M from Aak.

This leaves Aak…

Sign up to our weekly newsletter

Receive a weekly dose of discovery in your inbox. We'll also keep you up to date with New Scientist events and special offers.

Sign up

To continue reading, subscribe today with our introductory offers

Piano Exit Overlay Banner Mobile Piano Exit Overlay Banner Desktop