In demography, the phrase "historical demography" means studying the population processes of human populations of which we have historical records. In population genetics and other subfields of biology, it means trying to estimate past changes in population sizes based on the genetic patterns of current populations.
In demography, fecundity means capacity to produce babies and fertility means realized production of babies. In biology, these meanings are reversed.
In demography, EPC means European Population Conference, the largest yearly demography meeting in Europe. In biology, EPC means Extra-Pair Copulation.