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

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