A young lion cub perches alone on a mossy rock, wide-eyed and watchful, in this official Zoological Society of London postcard from the Regent's Park photographic series — arguably the most commercially appealing subject among the ZSL cards gathered in this small collection.

• Caption: "No. 20. All On His Own. Lion Cub"
• Photographer: D. Seth-Smith, F.Z.S.
• Publisher: Zoological Society of London, Regent's Park, N.W.
• Status: Unposted