Oak apple gall (Cynipidae) · Created by gall wasps in the family Cynipidae · 5/18/2013 · Oak Hill, Littleton Conservation Land, Littleton, Massachusetts ≈ 3½ × 3" (9.1 × 8 cm)
Oak apple gall (Cynipidae) · Created by gall wasps in the family Cynipidae · 6/1/2014 · Oak Hill, Littleton, Massachusetts ≈ 3 × 3" (7.8 × 7.6 cm)