Within the boundaries of the Pelagos Sanctuary, small young are born in the autumn of every year (around 6 metres in length and 2 tonnes in weight).
They can live for up to 80 years, provided they do not cross paths with the frequent fast boats in the summer, which they do not seem to be able to avoid when they surface to breathe.
In the same way as for sperm whales, this is currently the greatest risk of accidental death for them. For this reason, techniques are being developed in partnership with certain maritime companies to fit boats with detectors to warn of the risk of collisions with these huge mammals.