Marinemammals.be is the repository of all Belgian marine mammal observations and strandings gathered by the Royal Belgian Institute of Royal Sciences. It contains data ranging from sightings and strandings and the results of scientific research. It includes data about dolphins, whales and seals from Belgian waters. We also maintain some data from neighbouring countries (Northern France, the Netherlands). Until some decades ago, only few data were collected from stranded animals. Nowadays, full necropsies are performed and tissue samples are collected for research purposes. Registered users can request tissue samples.