Ingo Arndt / Ornate box turtle retracted into shell {Terrapene ornata} USA

Alex Mustard / 2020VISION / Detail of Plumose anemone (Metridium senile) in its retracted state at slack water when it is not feeding. Plymouth Sound, Devon, England, UK, English Channel, July

Rolf Nussbaumer / Portrait of Ornate Box Turtle (Terrapene ornata) with head retracted into shell. Sinton, Corpus Christi, Coastal Bend, Texas Coast, USA

Jim Brandenburg / Western Box Turtle (Terrapene ornata) retracted in shell, South Dakota

Georgette Douwma / Kaleidoscopic image of Partially retracted polyps of Goniopora sp. Lembeh Strait, North Sulawesi, Indonesia.

Magnus Lundgren / Wild Wonders of China / Retracted elephant ear anemone (Amplexidiscus fenestrafer) Xiaoliuqiu Island, Taiwan

Ingo Arndt / Dusky slug (Arion rufus) retracted for protection, Germany, May.

Constantinos Petrinos / Nagasaki damselfish (Pomacentrus nagasakiensis) portrait with Red Soft Coral Tree (Dendronephthya sp.), coral polyps retracted. Lembeh Strait, North Sulawesi, Indonesia.

Georgette Douwma / Partially retracted polyps of Coral (Goniopora sp) Lembeh Strait, North Sulawesi, Indonesia.

Willem Kolvoort / Aldabra Giant Tortoise (Aldabrachelys gigantea) close up of retracted head, Grand Terre, Natural World Heritage Site, Aldabra

Pete Oxford / Leather coral (Alcyonacea) some polyps out, some retracted. Fiji, South Pacific.

Alex Hyde / Dahlia Anemone (Urticina felina) with tentacles retracted in a rockpool at low tide, Isle of Skye, Scotland. UK. April. Sequence 2 of 2