Phenology
Phenology is the study of recurring plant and animal life cycle events in relation to climate and season. By observing these natural rhythms, we can engage visitors in hands-on learning experiences that deepen their connection to the natural world.
2025 Nature notes
June 6: First monarch eggs have been found
June 5: Green frog heard calling
June 1: Canada mayflower in bloom
May 30: Fireflies are out
May 6: Ramps are growing prolifically in Presque Isle and Upper Peninsula. Leatherwood is now in bloom, as well
May 4: Tree frog calls beginning
May 1: Our first ruby-throated hummingbird was spotted on campus
April 30: Dragonflies are emerging and beginning to mate!
April 25: Leopard frogs started called and ruby-crowned kinglet sighted and hermit thrush heard in the woods
April 24: Eastern phoebe heard and sighted
April 23: Broad-winged hawks, pine warblers, and merlin sightings. Salamander eggs found in local wetland
April 22: Yellow-rumped warblers have arrived on campus
April 19: Ice out on Statehouse Lake! White-throated sparrow, fox sparrow, and robins are seen on campus. One robin decided to nest at Discovery Hall entry again this year!
April 18: Ruffed grouse began drumming
April 16: Ring-necked ducks, buffleheads, golden-eyes, mallards, and Canada geese on Statehouse Lake
April 15: Snowed. Statehouse Lake is 85% open
April 13: Warm day (60 degrees F) & rainy night. Spring peepers singing and blue spotted salamanders moving through forest, wood frogs starting to sing and osprey have arrived back in the Northwoods
April 12: Song Sparrow and Eastern Phoebe singing on campus, bear scat seen with some bear activity (most likely males), Statehouse lake mostly covered, shoreline beginning to open up
April 11: Upper 50's, most of the snow is gone, some snowbanks, trails remain ice and snow covered (mostly)
April 10: Winter Wrens are back and singing
April 9: Snowshoe hares are brown again, Loon spotted on the WI River in St. Germain, cranes are flying over and calling
April 8: Robins are being spotted in the Northwoods, snow is disappearing and maple sap is still flowing heavily from the sugar maples.
March 30: Received an ice storm, followed by 5-6 inches of snow, leaving our grounds adorned in a March wintry scene.
March 27: Northern cardinal heard on NLDC campus!
March 25: Brown Creepers are back and singing!
March 21: First day of spring! Chipmunks have been seen out of hibernation.
March 15: American robins seen in the Mercer area.
March 13: Bald Eagles seen in Boulder Junction demonstrating cartwheel courtship display.
March 9: A few 50+ degree days caused most of the snow to melt. Statehouse Lake is starting to become slushy in areas, maple trees tapped
March 4: Manitowish Waters received 1 inch of rain, followed by 8 inches of snow.
Feb 27: Skunk seen in Winchester walking along the road.
Feb 26: Consistent days of 38-43 degree weather and sunshine could mean maple syrup season is approaching.
Feb 24: Barred owls heard calling in unison, mating season is here!
Feb 21: Wolves and coyotes are coming into estrus. During wolf track surveys, NLDC staff found raised-leg urination spots that had hints of blood in them, meaning wolves will be mating soon.
Jan 8: White-winged crossbills have been seen in flocks around the Northwoods, seems like a good irruption year for the species.
Jan 1: Poor snow conditions, but still better than last year's winter. Ground is covered in a 3-4 inches of ice and 1-2 inches of snow on top. Statehouse lake has 8-10 inches of ice.