sentence: Incubation times are long compared to other birds, as are fledgling periods.
sentences_before: Only a single egg is laid per nesting attempt, and usually only a single nesting attempt is made per year, although the larger albatrosses may only nest once every two years. Both parents participate in incubation and chick rearing.
sentences_after: Once a chick has fledged there is no further parental care.
concept_name: incubation time
headings: Procellariiformes