1: "Bluebirds lay eggs in spring"

2: "Nesting season for bluebirds is in April"

3: "Eggs hatch in May"

4: "Bluebird mating season starts in March"

5: "Incubation period lasts 12-14 days"

6: "Bluebird nests are built in cavities"

7: "Both parents share incubation duties"

8: "Bluebirds may lay 2-7 eggs per clutch"

9: "Bluebird fledglings leave the nest after 18-21 days"