Group of deer with white heart shaped patch on rump.
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I don't think it's possible to identify the species from this photo - I can see the pale rump patch, but there also appears to be the continuation of some dorsal coloration which I wouldn't expect in a roe deer.
OU Certificate in Contemporary Science
The location suggests either roe or sika as these are the commonest deer on Studland.
One of the animals has a clear white rump, roe deer have an off-white/cream rump. Also you can see a clear black line down the middle of the white rump again suggesting sika. The two tone coat mentioned by Gill is another indication of sika deer.
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Lat/Lng: 50.647, -1.964
OS grid ref: SZ026830