Thanks to Alan, who writes:
A river otter mother brought her pup to feed at the Arcata Marsh and Wildlife Sanctuary. The very young otter would start squeaking and urgently looking for its mom every time she dove, then chased her down when she surfaced. The large schools of smelt that gather in Arcata Marsh's tidal sloughs and saltwater ponds during the warm months make it a popular feeding spot for otters at they fish and forage around Humboldt Bay.