On the Alert ! Photo Shows : Kars perked , soft nose twitching and keen eyes peering intently , this mother wallaby crouches over her new - born baby , ready to make her escape , as she scents an invader in her domain . This picture was made - not in the Australian bush - but in Sailors ' Zoo , the only one of its kind in the world , Whale Island ( HMS Excellent ) at Portsmouth . The Zoo receives its exhibits mainly from officers and men of the Royal Navy . 9 Jul 1936 *** Local Caption ***