The quality or power of ready invention; quickness or acuteness in forming new combinations; ingeniousness; skill in devising or combining
Curiousness, or cleverness in design or contrivance; as, the ingenuity of a plan, or of mechanism
Ingenuity is skill at working out how to achieve things or skill at inventing new things. Inspecting the nest may require some ingenuity. skill at inventing things and thinking of new ideas
the property of being ingenious; "a plot of great ingenuity"; "the cleverness of its design