A Whidbey family plays on West Beach in Deception Pass State Park Thursday afternoon during an ultra-low tide. (Photo by Karina Andrew/Whidbey News-Times)

Whidbey residents flocked to Rosario Beach Thursday to examine a diverse array of marine life in tidal pools exposed by a super low tide. (Photo by Karina Andrew/Whidbey News-Times)

Ultra low tides Thursday exposed a fascinating array of critters in tidal pools on Rosario beach, including these sea cucumbers and anenome. (Photo by Karina Andrew/Whidbey News-Times)

A hermit crab climbs over tidal pools exposed by low tides at Rosario Beach. (Photo by Karina Andrew/Whidbey News-Times)

Beach-goers examine marine life in tidal pools at Rosario Beach. (Photo by Karina Andrew/Whidbey News-Times)

West beach visitors walk their dogs along a shore widened by super low tides Thursday. (Photo by Karina Andrew/Whidbey News-Times)

Deception Pass State Park volunteer Nan Maysen, left, points out a lined chiton to Rosario Beach visitors during low tide on Thursday. (Photo by Karina Andrew/Whidbey News-Times)