Sebastian Kennerknecht / Snowy Plover (Charadrius nivosus) nest in restored salt pond with shells laid by biologists to increase camouflage possibilities for adults, Eden Landing Ecological Reserve, Union City, Bay Area, Cali...

Philippe Clement / Predated egg shells of Common murre / guillemot (Uria aalge) broken and eaten by Herring gull or Great skua, Fowlsheugh, Scotland, UK, May

Philippe Clement / Predated egg shells of Razorbill (Alca torda) broken and eaten by Herring gull or Great skua, Fowlsheugh, Scotland, UK, May

Ingo Arndt / King Penguin (Aptenodytes patagonicus) egg shell of hatched chick, Jason Harbour, South Georgia Island, February

Sebastian Kennerknecht / Snowy Plover (Charadrius nivosus) nest in restored salt pond with shells laid by biologists to increase camouflage possibilities for adults, Eden Landing Ecological Reserve, Union City, Bay Area, Cali...

Markus Varesvuo / Hazel grouse (Tetrastes / Bonasa bonasia) nest with broken egg shells after hatching, Vaala, Finland, June.

Markus Varesvuo / Four Black grouse chicks (Lyrurus tetrix) in nest with broken egg shells, Vaala, Finland, June.

Stephen Dalton / Fruit flies (Drosophila melanogaster) on egg-shell, England, UK, August

Alex Hyde / Common Vapourer Moth (Orgyia antiqua) eggs hatching, with newly emerged caterpillars seen eating their egg cases. Derbyshire, UK, April

Juergen Freund / Egg cowries (Erosaria annulus) with their mantles surrounding their shells, Papua New Guinea.

Juergen Freund / Egg cowrie (Calpurnus verrucosus) West New Britain, Papua New Guinea.

Doug Wechsler / Green Stinkbug nymphs (Acrosternum hilare / Chinavia hilaris) and egg shells on milkweed leaf. Philadelphia, Pennsylvania, USA