atlantic bungalows cliff coastline Cornish cornwall England english enjoyment exercise footpath Great Britain homes houses natural nature ocean outdoors path rock sea shore surf track trail view walking water waves austere bare bleak canada cold dangerous difficult environment extreme face forbidding freezing frozen glacier harsh high ice icy mountain mountainside Rockies Rocky Mountains severe snow stern adult bird birds breed breeding coast colony crowd edge egg fledgeling group gull gulls immature kittiwake line nest Rissa tridactyla sea birds seabird seabirds Sussex young away background break coruna craggy erode eroded erosion estacas eu fracture galicia lines rocks rocky saavem sheer solid Spain steep stone stratify stratum texture wear wearimg