Nest-building.April and July were the lowest nidification periods for Trypoxylon species....
The language of Wilson and Audubon is somewhat ambiguous, but may fairly be taken as implying the male bird's presence throughout the period of nidification.
When a raven is killed during nidification, the bereaved mate goes away, and after a short absence returns with another raven.
Origin
Mid 17th century: from Latin nidificat- 'made into a nest' (from the verb nidificare, from nidus 'nest') + -ation.