Upcoming Events

Refuge Readers. Friday, April 17, 2-3:30 p.m. Discussion of The Snoring Bird by Bernd Heinrich. Copies are available for loan at the Visitor Center. New members always welcome. Visitor Center.

Great Swamp Strike Team Work Days. Fridays, April 24, May 1 & 15, June 5 & 19, July 17, 9 a.m.-noon. Help eradicate emerging invasive plant species. Work days on the 1st and 3rd Fridays of each month. Volunteers Needed! Visitor Center.

Volunteer Orientation. Sunday, April 26, 1:30—3 p.m. Interested in volunteering? Need Community Service hours? Come learn about the many volunteer opportunities at Great Swamp National Wildlife Refuge. For new and prospective volunteers. Visitor Center.

Lets go outside paw print

Frog Walk. Sunday, April 26, 7-8:30 p.m. Join us on an evening interpretive walk to learn spring frogs by their calls! Meet at Wildlife Observation Center.

Lets go outside paw print

Refuge Ramble. Sunday, May 3, 1:30-2:30 p.m. Join us as Refuge Rambles resume. We’ll check out signs of Spring on this informal, interpretive walk. Dress warmly. Visitor Center.

Lets go outside paw print

International Migratory Bird Day Mother’s Day Bird Walk. Sunday, May 10, 10 a.m.-noon. Improve your birding skills and learn to identify the spring migrants. Bring binoculars or borrow ours. Join us… whether you know a little or a lot! Visitor Center.

Lets go outside paw print

All About Bluebirds. Sunday, May 10, 1:30-3:30 p.m. with volunteer Leo Hollein. Indoor presentation followed by a peek inside an active bluebird nest box. Visitor Center.

Lets go outside paw print

indicates programs suitable for children

Download the Event Calendar:
Get Adobe Reader April-September 2015 (pdf, Adobe Reader required).


Find us on Facebook


Songs of Spring

Frog Walk, Sunday, April 26, 7–8:30 p.m.
Meet at Wildlife Observation Center

Yes, the birds are singing. But the frogs are calling too! As musicians who have recently emerged from the winter hibernation, they have a broad repertoire! They are calling from the water and from the trees, with voices ranging from high trills to deep twanging sounds.

Red knot and horseshoe crab

Spring peeper baby. Photo by Robert Lin.

Come to the Frog Walk, and gain a whole new perspective on spring song. We may hear (and see) the green frog, which stays near the water and calls in a throaty “boink” like the sound of a banjo string. Also in the water, the bullfrog calls with a deep sounding “rr-uum”. And we may find northern spring peepers, in moist areas of woods, brush and fields, calling with a short, high-pitched “peep, peep, peep, peep”. In the trees of the swamp, the northern grey treefrog may be calling with a bird-like trill.

Red knot and horseshoe crab

Bullfrog. Photo by Patrick Spurlock.

So to enjoy this spring concert and learn the frog calls, join Ranger Dave Sagan for the evening interpretive Frog Walk. Sunday, April 26, 7–8:30 p.m. Meet at the Wildlife Observation Center, 220 Long Hill Road, Harding Township.

For a preview of sounds, try this website from the University of Michigan, Museum of Zoology.


See more photos on the
Refuge’s Flickr page.

Click on the Great Swamp NWR link in the top right corner below to go to the eBird website. There you can look at the data in more detail.