A population of marine snails has natural variation in shell thickness. A new crab predator species is introduced to their habitat.

Farmers began using a new pesticide on beetles that damage crops. Scientists collected data on the beetles' resistance to the pesticide over five years.

Researchers measured the beak thickness of a finch population before and after a severe three-year drought.

Microbiologists sampled an E. coli population in a wastewater system before and after increased antibiotic contamination.

Researchers are studying how a mosquito population adapts to a new chemical insecticide.

In a forest near Manchester, England, researchers tracked a population of Peppered Moths over several decades.