Baby Cormorants staying cozy.
“The sole member of its genus, it is unusual for having spined antler-like projections on its gill covers; it can raise the projections as a defense mechanism.” (Wikipedia). These barbs were very sharp when I picked him up! At Elkhorn Slough National Estuarine Research Reserve.
Eelgrass (Zostera marina) Native, seagrass with long flat blades and roots that grow in the mud. Habitat: quiet bays with muddy bottom and estuaries.
Beachcombers's Guide to Seashore Life of California, J.D. Sept, Rev. ed. 2009, p. 253.
Jepson eFlora https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=48950
Looks like a red seaweed. . .
In mid(?) intertidal zone at Elkhorn Slough National Estuarine Research Reserve.
Gutweed
(Ulva intestinalis) Narrow flattened/wavy blades of neon-green Algae in high intertidal zone. U.intestinalis is a Green Alga in the family Ulvaceae, known by the common names sea lettuce, gutweed, and grass kelp.