Learn about “Owls of Massachusetts” in an online course offered by Mass Audubon, Fridays beginning January 15th, from 7 to 8:30 p.m. Registration for all six sessions is $90 at massaudubon.org. There is also “Tracking Mammals in Winter,” an online course on Wednesday, January 20th, from 7 to 8:30 p.m. Learn how “creatures leave behind visible tracks, trails, and subtle clues about their daily and nightly routines.” Registration is $24.