Butler County Heritage Center, 119 W. New Castle St., will be open from noon to 4 p.m. Dec. 27. The William A. Lowry Family exhibit is now open for viewing. Lowry was a prominent Butler citizen who was a Civil War veteran and community leader. He married Annie Zeigler, daughter of politician Jacob Zeigler. The museum is also home of the Bantam jeep and the hand-carved and hand-painted Jay Bee Miniature Circus. Admission is $5 for adults, $2 for children ages 5 to 17, and free for those younger than 5. Call 724-283-8116. The annual holiday catalog of the Butler County Historical Society is available, a highlight of which is the 2010 Historic Schoolhouse Wall Calendar.

Harmony Museum on Mercer Street in Harmony is the site of the annual Christmas season display of the Yobp-Eckstein log house village and toy railroad on view through early January. Hours are 1 to 4 p.m. daily; closed Mondays and holidays. Reservations are suggested for weekends and required for groups. Call 724-452-7341 or 888-821-4822, or visit the Web site, www.harmonymuseum.org.

<B>National Aviary</B>, 700 Arch St., hosts a holiday bird show at 1:30 p.m. Saturday and Sunday. Many of the aviary's most popular birds will make appearances in conjunction with their favorite carols, including "Duck the Halls," "I'm Dreaming of a White Chicken," and "Ruby the Red-feathered Macaw." Regular fall/winter hours are 10 a.m. to 5 p.m. Mondays through Saturdays and noon to 5 p.m. Sundays. Admission is $10 for adults; $9 for senior citizens; $8.50 for children ages 2 to 12; and free for children younger than 2. Call 412-323-7235 or visit the Web site, www.aviary.org.<B>Pittsburgh Children's Museum</B>, 10 Children's Way, Allegheny Square, is presenting "Tough Art" through Jan. 10; plus classes in baby yoga, clay art and cartooning. Hours are 10 a.m. to 5 p.m. Mondays to Saturdays; and noon to 5 p.m. Sundays, except holidays. Admission is $11 for adults; $10 for senior citizens and children ages 2 to 18, and free for children younger than 2. Parking is $5 for nonmembers. Call 412-322-5058 or visit the Web site, www.pittsburghkids.org. The museum will be closed on Dec. 25 and Jan. 1. The New Year's Eve celebration from 11:30 a.m. to 3 p.m. will include a singalong to "Auld Lang Syne" with the Lee Robinson Duo and a Family Dance Party in the theater.<B>ToonSeum</B>, Pittsburgh's Museum of Cartoon Art at 945 Liberty Ave., is open during December from 10 a.m. to 3 p.m. Wednesdays and Thursdays, 10 a.m. to 7 p.m. Fridays, 10 a.m. to 9 p.m. Saturdays and 11 a.m. to 4 p.m. Sundays, except holidays. Admission is $4 for adults and $3 for children ages 5 to 17; children younger than 5 are admitted free. Visit the Web site, www.toonseum.org.<B>Heinz History Center</B>, 1212 Smallman St., continues "Pittsburgh: A Tradition of Innovation" celebrating Pittsburgh's impact on the world over the past 250 years, and "Lincoln: The Constitution and the Civil War" and "Lincoln Slept Here," a traveling exhibition from the National Constitution Center in Philadelphia on view through Jan. 3. Also showing are "Behind the Scenes with the Pittsburgh Steelers: Photographs by Mike Fabus" and "Forbes Field: A Century of Memories." Center hours are 10 a.m. to 5 p.m. daily, except holidays. Admission is $10 for adults, $9 for senior citizens age 62 and older, $5 for students with ID and for children ages 4 to 17, and free for children 3 and younger. Call 412-454-6000.<B>Phipps Conservatory and Botanical Gardens</B> in Schenley Park continues "Life in the Gardens: Fräbel Glass at Phipps" through January. This exhibit features the work of German-born artist Hans Godo Fräbel, a founding father of modern glass sculpture. Phipps is open daily from 9:30 a.m. to 5 p.m. and until 10 p.m. on Fridays, except holidays. Admission rates are $10 for adults, $9 for seniors age 62 and older and students with ID, and $7 for children ages 2 to 18. Phipps members and children younger than 2 are admitted free. Call 412-622-6914 or visit www.phipps.conservatory.org.<B>Carnegie Science Center</B>, One Allegheny Ave., North Side, has reopened the Miniature Railroad & Village exhibit with the new replica of Fallingwater in time for the holidays, plus "The Polar Express" has limited showings in the Rangos Omnimax Theater. The center will be closed because of Steelers home games on Sunday and Dec. 27. Regular hours are 10 a.m. to 7 p.m. Fridays and Saturdays and from 10 a.m. to 5 p.m. Sundays through Thursdays; closed holidays. Regular admission is $14 for adults and $10 for senior citizens age 62 and older and children 3 to 12. Parking is $5. Call 412-237-3400 or visit the Web site, www.carnegiesciencecenter.org.<B>Carnegie Museum of Natural History</B>, 4400 Forbes Ave., Oakland, as always, features "Dinosaurs in Their Time." Continuing through May 2 is the traveling exhibition "Whales/Tohora," an interactive exhibit. Museum hours are 10 a.m. to 5 p.m. Tuesdays through Saturdays, with additional hours until 8 p.m. Thursdays, and noon to 5 p.m. Sundays. Closed major holidays. Admission, which includes the Carnegie Museum of Art, is $15 for adults, $12 for senior citizens, and $11 for students and children age 3 and older, and free for members and children younger than 3. Call 412-622-3131 or visit www.carnegiemnh.org.