animal England equus farm fence field Great Britain horse landscape mammal natural nature short short-legged South Downs Sussex winter adaptable agile arboreal brown bushy-tailed callosciurus-notatus common diurnal fencing handrail olive-brown omnivore omnivorous oriental-squirrel park plantain-squirrel rodent Singapore small squirrel striped tricoloured-squirrel widespread wildlife Asian Asian wild horse color coloration colored coloring coloured colouring distinctive Dzungarian horse endangered equine equus ferus przewalskii grazer grazing herd-animal mane mongolian Mongolian wild horse preservation rare stocky strong sturdy takh upright-mane wild horse subspecies