The Peggy Notebaert Nature Museum attracts young children and weary caregivers — and us. The Butterfly Haven alone is worth the cost of admission, but we also love visiting the Beecher Collections Laboratory and related exhibits, and I adore the “Heritage of the Chicago Academy of Sciences” room. Although smaller, “Frogs: A Chorus of Color” actually gives the Shedd’s “Amphibians” a run for its money. (Note that “Frogs” closes on January 22.)