Estimated pregnancy rates, based on the presence of a foetus and excluding the conception period, of mature female harbour porpoises.

<p>¹Included porpoises from the Iberian Peninsula population, and all causes of death.</p><p>²Included porpoises from the Danish North Sea and Inner Danish waters.</p><p>³Average age of 50% mature.</p><p>⁴Mean age of first-time ovulators.</p><p>⁵Study did not exclude the mating period, and included two recently pregnant lactating females.</p><p>Estimated pregnancy rates, based on the presence of a foetus and excluding the conception period, of mature female harbour porpoises.