Good idea in Oxfam about buying trees; I used to belong to the Woodland Trust and when you joined, you were assigned a tree, not named though as I had hoped - I went to find mine and travelled out of London to where it was planted and found thousands of other baby trees there with no clues as to which one was 'mine' (IMG:
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Following on from that, local zoos and the like often run 'adopt-a-monkey' or whatever schemes.
Excellent idea!