Karine Aigner / Biologists sift through Burmese pythons (Python bivittatus) faeces to see what invasive pythons are eating. Florida, USA, July 2018.

Tony Wu / Nudibranch (Melibe pilosa) expanding and extending its semi-transparent oral hood to scoop up rubble and sift through it for food. Lembeh Strait, North Sulawesi, Indonesia.

Pascal Tordeux / Farmer with milk to be sent to the Bourg-Saint-Maurice dairy for Beaufort cheese, Savoie, Rhone-Alpes, France, May 2014.

Willem Kolvoort / Swan mussel {Anodonta cygnaea} Close up of mantle showing tentacles that sift out debris during feeding, Holland

Pete Oxford / Collected nurdles, toxic plastic pellets, washed up ashore, after community based clean up. Betty's Bay, Western Cape, South Africa.

Pete Oxford / Collected nurdles, toxic plastic pellets, washed up ashore, after community based clean up. Betty's Bay, Western Cape, South Africa.

Juergen Freund / Woman sieving sago flour, a starchy food staple most commonly made from Sago palm (Metroxylon sagu). West Papua, Indonesia. 2018.

Edwin Giesbers / Insect sample draining in sieve prior to weighing. Long-term monitoring has revealed a 75% decline in insect biomass over 27 years. Entomological Society Krefeld, Germany 2019.

Edwin Giesbers / Insect sample draining in sieve prior to weighing. Long-term monitoring has revealed a 75% decline in insect biomass over 27 years. Entomological Society Krefeld, Germany 2019.