Happywhale is a global citizen science program using a web-based marine mammal photo ID crowd-sourcing platform. Some data has been contributed under INTAROS WP4. Happywhale engages citizen scientists to identify individual marine mammals, for fun and for science. Happywhale tracks individual whales throughout our world's oceans. Per January 2021 438,613 photos have been submitted and 50,271 individual marine mammals have been identified, mostly humpback whales. The data collection may enable a better understanding of whale numbers, distribution and population dynamics which may for instance be useful for area-based management measures such as zoning.