chalk crop downland England english exercise farm field grassland Great Britain hill landscape meadow national park nature summer Sussex track trail view walk ridge arch essex garden green home house leisure national trust Paycocke's peace plants pleasure refresh roof spring tranquil white autumn beautiful beauty color colour fall lake park Sheffield Park tourists trees water animal bush dry giraffe high hot Kenya park Africa patch tree reserve safari Serengeti travel trip turism warm wilde grass Masai Mara Nairobi tall tree vacation african elephant heavy hippo hippopotamus Hippopotamus amphibi Tanzania cloud graze hills lamb livestock mammal natural rural sheep sky South Downs storm