In a few special places in the UK there are river plains that flood in the winter that are home to large numbers of snakes head fritillarys. If you vitit them in late April you are likely to see an amazing display such as these flowers I photographed in Fox Fritillary Medown in Suffolk. Sights such as these where once common in the UK. Now sadly they are rare as most of the suitable land has been "improved" for agricultural use.