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For decades now many of us have enjoyed seeing David Attenborough in exotic locations around the world bringing his encounters and understanding of the living world to our homes.

One of Sir David鈥檚 enduring fascinations remains what is and who laid the world鈥檚 largest egg. In this week's Letter from David Attenborough he continues his personal account of some of his great experiences and revelations around the world 鈥� And this week he presents, in his own words, 鈥淕iant Birds鈥�.

The scene is set in Madagascar where, in a break between filming, Sir David starts piecing together large fragments of an egg with sticky tape to discover it is clearly 鈥渢he size of a rugby ball鈥�.

Whether this is the largest egg in the world and when and which creature laid it is all revealed in David Attenborough鈥檚 letter here on World Service.