Chinese Water Deer are native to China and Korea. There are feral populations of escapees in the UK and elsewhere.
They are slightly smaller than Roe Deer but slightly larger than Muntjac.
They have red coats with a distinctive grey patch on their muzzles.
Despite really good hearing, they can be startled when you creep up on them.
A pair of water deer by water
The cloven hoof and the tusk-like tooth of the male.
Bucks don't grow antlers but use their tusk-like, long canine teeth in fighting.
The female doesn't have the long, tusk-like canine teeth.
Since they can smell people at some 100 metres away, the usual view (if seen at all) is a disappearing behind.