This is a young Orang Utan playing with it's younger brother (or sister). The baby is still not old enough to get about on it's own and spends most of it's time with the mother. Like most mother's however, she needs a break now and then and passes it to it's older sibling to look after. The expression on the older Orangs face would seem to suggest that it is ready to hand the baby back !
I have started uploading a load of pictures of these Orangs (see my 'Orang Utan family' gallery) including several of these two guys playing. There is also a gallery of a Coati family if you like cute animals. More shots from my day at Chester Zoo will be uploaded shortly.
All comments are welcome, I appreciate the feedback. Thanks.