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Citizen science projects increasingly rely on ordinary volunteers to gather data that would otherwise be too costly for research institutions to collect alone. In one coastal monitoring initiative, thousands of residents photograph tide pools each month using a shared smartphone app, and the images are later verified by marine biologists before being added to a public database. Organisers report that volunteer contributions have expanded the geographic coverage of the study far beyond what paid staff could achieve, though data quality varies, and roughly one in five submissions is discarded due to poor image focus or incorrect species labelling. Despite this, the project has already documented the northward migration of several tide pool species, a trend scientists say would have taken years longer to detect through traditional fieldwork alone.