Editing Razorbill (section)

=== Reproduction ===
Individuals only breed at 3–5 years old. As pairs grow older they will occasionally skip a year of breeding. A mating pair will court several times during breeding periods to strengthen their bond.<ref name=Conder/> [[Courtship display]]s include touching bills and following one another in elaborate flight patterns. Once the pre-laying period begins, males will constantly guard their mates by knocking other males away with their bills.<ref name=Conder/> The pair will mate up to 80 times in a 30-day period to ensure fertilisation.<ref name=Wagner1992/> Females will sometimes encourage other males to engage in copulation to guarantee successful fecundity.<ref name=wagner/>

Throughout the pre-laying period, razorbills will gather in large numbers. Two types of social behaviour occur; large groups dive and swim together in circles repeatedly and all rise up to the surface, heads first and bills open; secondly, large groups swim in a line weaving across each other in the same direction.