Photo collage of examples of invasive species likely to leave a fossil record

Examples of invasive species likely to leave a fossil record: a, Asian clams at Teddington Lock on the River Thames, UK; b, Asian clams in the River Soar, Leicestershire, UK; c, quagga mussels revealed on the rocks lining Grafham Water reservoir, UK, during low water levels.; d, zebra mussels on a native freshwater clam in Manitoba, Canada; e, Himalayan balsam along the banks of the River Soar, Leicestershire, UK; f, cannibal snail on Kauai, Hawaii; g, Pacific oysters at the village of Yerseke, Netherlands; h, Amur River clams recovered in core sediments from San Francisco Estuary, USA; i, red swamp crayfish, Procambarus clarkii, collected from irrigation canals in Uganda and widely introduced for food; j, common ragweed growing in a chicken house in Belgium; k, cane toad in the Philippines; l, shells of zebra and quagga mussels lining a small stream in the UK. Shells enter the location from an upstream reservoir.