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Predator Ecology - Wildlife tracking program today, 9:30 a.m.-12:30 p.m., Arcadia Wildlife Sanctuary, Easthampton. Preregistration is required. Fee: $15. Call 584-3009 or send an email to arcadia@massaudubon.org.

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Mammal Tracking for Families - Today from 9 a.m. to noon at Northfield Mountain Recreation Center, Route 63, Northfield. For information, call 800- 859-2960.

Winter Raptors - Outdoor program today from 10 a.m. to 2 p.m. at the Arcadia Wildlife Sanctuary in Easthampton. Fee: $12. Preregistration is required. Call 584-3009.

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Mammal Tracking in the Northeast - Field trip today, 9 a.m.-noon at Graves Farm Sanctuary in Williamsburg. Fee: $20. Preregistration is required. Call 584-3009 or send an email to arcadia@massaudubon.org.

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Winter Trails Day - Day of free outdoor winter activities today, Northfield Mountain Recreation Center, Route 63, Northfield. Cross-country ski lessons, wax clinic, snowshoe hike. Trail fees will be half-price; free for first-timers. For information, call 800-859-2960.

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Williamsburg First Day Hike - The Williamsburg Woodland Trails Committee sponsors a moderate 1.5 mile scenic hike Sunday. Meet in the Dunphy School parking lot at 10 a.m. Bad conditions cancel. For information, call 268-9927 or 268-7523.

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Williamsburg First Day Hike - The Williamsburg Woodland Trails Committee sponsors a moderate 1.5 mile scenic hike Jan. 1. Meet in the Dunphy School parking lot at 10 a.m. Bad conditions cancel. For information, call 268-9927 or 268-7523.

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Solstice Headlamp Hike - Nighttime holiday celebration for hike lovers along ski trails Thursday, 6-9 p.m., Northfield Mountain Recreation Center, Route 63, Northfield. Campfire, cider, snacks provided. For information, call 800-859-2960.