Daily Postcard: Western Tiger Swallowtails ‘puddling’ in mud on Monday at the reservoir. Butterflies do this instead of just drinking to obtain minerals as well as water. On Monday, there were about 50 of these butterflies gathered at the west end of the reservoir. Photo by Michael Smith

Another view of Western Tiger Swallowtails ‘puddling’ in mud on Monday at the reservoir. Photo by Michael Smith