Ralph Pace / Swell Shark (Cephaloscyllium ventriosum) egg case and embryo, Monterey, California

Terry Whittaker / Water vole (Arvicola amphibius) feeding on Yellow flag iris (Iris pseudacorus) seed pods, Kent, England, UK. October.

Steve Downer / Yellow slug (Limax flavus) back lit embryo moving around in egg case.

Steve Downer / Yellow slug larva (Limax flavus) emerging from an egg case, controlled conditions.

Steve Downer / Yellow slug larva (Limax flavus) emerging from an egg case, controlled conditions.

Ingo Arndt / Caddisfly (Limnephilidae) case built out of sticks and bark fragments, Germany, November.

Ingo Arndt / Caddisfly (Limnephilus sp.) case built of sticks, wood fragments, seeds, snail shells and plant stems, Germany, November.

Ingo Arndt / Four spotted libellula dragonfly / (Libellula quadrimaculata) adult freshly emerged from larval case, Germany.

Jordi Chias / Spotted catshark (Scyliorhinus canicula) just hatched from egg case that is on Seafan (Paramuricea clavata), Ullastres seamount, Costa Brava, Llafranch, Catalunya, Spain

Jan Hamrsky / Case-building caddisfly larva (Trichoptera), Europe, June. Controlled conditions.

Gavin Hellier / Traffic lights and office buildings illuminated at dusk, part of new urban development, modern architecture skyscrapers in Potsdamer Platz, Berlin, Germany, 2007. As was the case in much of Berlin,...

Ross Hoddinott / 2020VISION / Large red damselfly {Pyrrhosoma nymphula} emerging from nymphal case, Cornwall, UK. April