5 years ago we would have never imagined that we’d have over 1.2 million birds cataloged and new insights into the migration along the Indiana Dunes that we have today. The migration along the shores of Lake Michigan is a wondrous event that as we learn more, more questions come up. When we first started the longshore flight survey, timings were unknown. Did migration start in March, February? Do we need to be out in south winds only? What about east winds? What exact conditions will initiate a raptor flight? Today we certainly know much more. We know more about timings of migration, but variables such as climate change, storm events, habitat destruction and restoration throw wrenches into our knowledge and not only justify, but necessitate the continued study we’re embarking on again this year.
The 2017 longshore flight season traditionally starts officially the first full weekend in March. For two years in a row now, we’ve seen that migrants are already starting before this date. We logged a few “preseason” counts last year in February, and the wild weather of this past winter has us doing it again. It feels odd to be doing spring migration counts when it’s still officially ornithologic winter. While many migrating birds are still enjoying the warm climate of the tropics and are otherwise unwise to the warm winter events happening in the Great Lakes, thus we would not expect them to return early, many short distant migrants have taken advantage of the warm weather and southerly winds to arrive early. The race to mate has brought woodcocks, pintails, snow geese, and Sandhill Cranes into the dunes earlier than usual. This arrival carries a risk. Should a major snow storm arrive and bury the dunes in a March storm, these same birds who are pioneers in migration, may find themselves a footnote instead.
For those not as familiar with the longshore migration count done atop the old Green Tower at Indiana Dunes State Park, our long running blog has a great archive of past posts. March 2012 has many posts that describe our count, the birds seen, and some of the early numbers we posted when we first started. 2017 has four official count days already in the books. When we noticed Sandhill Cranes migrating in earnest, we set out to make sure they were getting logged. With an eastern population of 100,000 birds, it’s pretty significant that 1/3 of the entire population is flying over the Indiana Dunes in it’s migration route.
The most recent flight, yesterday, was a big movement of cranes, with a few early associated raptors. 6,180 Sandhill Cranes flew over the Indiana Dunes area on it’s way north. Yesterday’s crane count was the 4th highest count ever logged from the tower site. With many more thousands being seen to the fish and wildlife areas to our south, the migration is still far from done.
Another 39 raptors went by, with Red-tailed Hawks being the largest majority. At 11:15am, a magnificent GOLDEN EAGLE flew directly over the tower and decided to kettle right over the counters. The bird circled for approximately 3 minutes as it climbed higher and higher before drifting west along the shoreline. No doubt on it’s way back to northern Canada.
The Indiana Dunes State Park is the single most diverse site in Indiana for birds. With over 300 species seen in the park, the single longshore tower site is the most productive single site in the state to find birds over the course of the year. With the advent of eBird, we can now share the full sightings that we log via the hotspot for the tower site. We look forward to sharing the spring migration with you!