Women watching what rock-pool animals do between tides

Watch the animal before naming it

Elizabeth Mills, who makes MarineMumbles, is the strongest place to start for an explanation of life between tides. Her self-made YouTube series When the Tide Retreats includes Survival on the Shore, a rock-pooling episode. Her own site also pairs photographs with an account of how beadlet anemones retract their tentacles when exposed and use them to capture food in water.

References: Elizabeth Mills / MarineMumbles · Elizabeth Mills / MarineMumbles

In a pool, Mills stays with a small crab instead of moving immediately to the next find. It pauses beside a patch of seaweed, crosses an open space and disappears into a crevice. The useful part is the sequence: where it was exposed, where it went, and how its shelter looked before it entered. A name on its own would not show any of that.

Pulenaz brings a more casual eye to a short shore visit. She settles beside a pool, waits while the ripples fade and notices a snail slowly changing position on the rock. She keeps the same patch in frame, then points out where the snail was at the beginning. Her unhurried attention makes a small movement legible without turning the outing into a lesson in identification.

A pool is a refuge, but the tide changes the shore

Intertidal animals face both immersion and exposure. Some shelter in pools or crevices; hard shells can help reduce water loss. Mussels attach to rock with strong threads and form beds that also hold water and provide shelter for other organisms. Anemones have a different solution: when exposed, they contract into small blobs. Mills describes the beadlet anemone drawing in its tentacles to reduce drying.

References: U.S. National Park Service · Elizabeth Mills / MarineMumbles

Look at a beadlet underwater and then at an exposed one on a separate visit: the extended tentacles and the compact shape are two states of the same kind of animal. A pool can retain water at low tide, but its conditions change too. The practical question to carry into Mills’s videos is what the animal is doing while submerged and what protects it when the water recedes.

References: Elizabeth Mills / MarineMumbles · Kent Wildlife Trust

Periwinkles offer another contrast. They can close a door in the shell to retain water, then move to feed. A motionless shell on exposed rock is not the whole story; the position and whether the animal is submerged matter when interpreting what you see.

References: National Marine Aquarium

Look beyond the pool

Heather Buttivant, creator of Cornish Rock Pools, gives a useful written and photographic counterpart to Mills’s videos. In one shore account she pauses over rainbow wrack, noting a cowrie moving across a cushion star and a covering of other animals. Her attention shifts from the apparent single mass of seaweed to the animals living on and around it.

References: Heather Buttivant / Cornish Rock Pools · Heather Buttivant / Cornish Rock Pools

The exposed shore is worth examining as well as the water. Seaweed can provide refuge from predators, waves and temperature changes; limpets and other grazers feed on algae. Those relationships help explain why a patch of wet seaweed or rock may be productive to watch, even when no pool is immediately visible.

References: U.S. National Park Service

Pulenaz notices that change in scale on her walk back: first a patch of seaweed, then a small shell beside it, then a crab moving along the edge of a shallow channel. She watches from above rather than lifting the animal. The channel connects the pool to the wider shore in the story, and the crab gives her a reason to stay with one place for a little longer.

Give the shore time and room

Approach quietly and stay still long enough to see movement. Check local tide times and keep a clear route back as the water returns; wet rock and seaweed can be slippery. Watch your footing, avoid stepping on animals and leave attached creatures in place. Looking closely without lifting or feeding anything preserves the behavior you came to see.

References: Kent Wildlife Trust · Isles of Scilly Wildlife Trust

Choose Mills for a woman-led explanation of how shore animals cope between tides, Buttivant for detailed photographs and writing that linger over a patch of shore, and Pulenaz for the pleasure of noticing an ordinary small discovery in real time.

Sources and attribution

1. Elizabeth Mills / MarineMumbles

   MarineMumblesPublication date not listed · Recorded Oct 29, 2026

2. Elizabeth Mills / MarineMumbles

   Beadlet Anemone – Actinia equinaPublished Mar 6, 2016 · Recorded Oct 29, 2026

3. Heather Buttivant / Cornish Rock Pools

   Wishing on a Rosy Feather StarPublished Jan 30, 2023 · Recorded Oct 29, 2026

4. Heather Buttivant / Cornish Rock Pools

   AboutPublication date not listed · Recorded Oct 29, 2026

5. U.S. National Park Service

   On the Edge: The Curious Lives of Intertidal Organisms and How We Monitor ThemPublication date not listed · Recorded Oct 29, 2026

6. National Marine Aquarium

   Rockpooling: A Beginners GuidePublication date not listed · Recorded Oct 29, 2026

7. Isles of Scilly Wildlife Trust

   Seashore codePublication date not listed · Recorded Oct 29, 2026

8. Kent Wildlife Trust

   How to go rockpooling with the familyPublished Jul 3, 2023 · Recorded Oct 29, 2026