AEWA beach bird birding birds Calidris alba coast Incredible India India migrant migratory rest resting rocks Sanderlings splash surf water bank feet foot footprint hunt leg mark marks print river sand sandy shoe shoes toe toes trail trails bond bonding care fond fondness fun happy love parent parents protect relationship relationships rise sun sunrise sunset waves gold golden light lights magic ocean sea set silhouette walk walking busy buzz crowd dusk hour hours magichour people wave