Looking down into a tide pool from a rock above. The white is barnacles and snails, followed by blackish algae, thence into the water with green sea anemones (Anthopleura xanthogrammica)and purple sea urchins (Strongylocentrotus purpuratus)

A large green sea anemone (Anthopleura xanthogrammica) with a mussel shell near its feeding orifice.The sea anemone will ingest the mussel, absorb edible materials, and excrete the shell through the same orifice.

An ochre starfish (Pisaster ochraceus) with a fellow starfish below it.

A striped shore crab (Pachygrapsus crassipes)peering out from its hiding place

Various shrimp collected in the intertidal zone

A large sea anemone

A large sea anemone

A red sea anemone (Tealia lofotensis)

A red sea anemone (Tealia lofotensis)

A gumboot chiton (Cryptochiton stelleri) . This mollusk is very large, at least 30 centimeters long and weighing one kilogram.

In a giant kelp forest of Macrocystis pyrifera

A black and yellow rockfish (Sebastes chrysomelas) among a group of red sea anemones and three orange seastars

A striped surf perch (Embiotoca lateralis) and three orange seastars

Tiger rockfish (Sebastes nigrocinctus)

A garibaldi (Hypsypops rubicundus)

A small sculpin. Note the extended feeding arms on the coralline algae.

Starfish (Pisaster giganteus)

Starfish (Pisaster giganteus)

Orange cup coral (Balanophyllia elegans). The only shallow-water stony coral found in California waters.

Feather duster worm

Colorful bat starfish (Patiria miniata)

Strawberry sea anemones (Corynactis californica)

Red sponge colony

Yellow sponge colony

Tunicate

Spanish shawl elegant eolid nudibranch (Flabellinopsis iodinea)

Salted dorid nudibranch (Doriopsilla albopunctata) on large globular sponge

Salted dorid nudibranch (Doriopsilla albopunctata)

Salted dorid nudibranch (Doriopsilla albopunctata)

Salted dorid nudibranch (Doriopsilla albopunctata)

A purple sea urchin (Strongylocentrotus purpuratus)

Chestnut cowry (Cypraea spadicea)

Chestnut cowry (Cypraea spadicea)

Chestnut cowry (Cypraea spadicea)

Strawberry sea anemones (Corynactis californica)

Strawberry sea anemones (Corynactis californica) and a colorful nudibranch (

A red sea anemone (Tealia lofotensis)

A red sea anemone (Tealia lofotensis)

Strawberry sea anemones (Corynactis californica)

Head end of a holothurian or commonly called sea cucumber

Large green anemone with spines from sea urchin in foreground

Holothurian or commonly called sea cucumber

Mixed fauna with christmas tree worms (Spirobranchus gigantea)

A red sea anemone (Tealia lofotensis)

Red abalone (Haliotis rufescens)

Red abalone (Haliotis rufescens)

Keyhole limpet (Fissurella volcano)

By-the-wind sailor (Velella velella)

Colonial anemones (Anthopleura elegantissima) closed up at low tide.

Great white shark (Carcharodon carcharias) caught by fisherman in small boat close to Bodega Bay study area.