Mid-Coast Audubon offers talk on visiting finches Share Mid-Coast Audubon and Camden Public Library will host a free Zoom presentation about the northern finch winter visitors at 6 p.m. Thursday, March 18. To register for the event, email Julia Pierce at [email protected]. Crossbills Photo courtesy of Tom Johnson Irruptions — a sudden population spike — of finches from the north inspired Matthew Young to launch the Finch Research Network (FiRN) last fall. Young will discuss what an irruption is, and highlight Redpolls, Pine Grosbeaks, Evening Grosbeaks, and the distribution and ecology of different Red Crossbill flight calls. He will also introduce FiRN and its citizen science opportunities.