The 2015 Bradbury Mountain Spring Hawkwatch, co-sponsored by Freeport Wild Bird Supply and Leica Sport Optics, came to its conclusion on May 15th. This season was an interesting one, especially in how the weather affected our counts. During the 2-month period, the Official Hawkcounter, Andrew Wolfgang, tallied a total of 3628 raptors. This included vultures, hawks, eagles, and falcons. Over the 8-year span that we have conducted this standardized count, this year was the second lowest, coming in 12% below average.
Welcome to spring hawkwatching in Maine, Andrew!
However, a single year’s count tells us little beyond what the weather conditions were like during the course of the season. The late arrival of spring was actually a benefit to the count at the start, as few early migrants had progressed north by March 15th. Therefore, we had very good counts of our earliest migrants: Bald Eagles, Red-shouldered Hawks, and Turkey Vultures. In fact, we set a new record for eagles deemed migrating, and vultures produced our second highest tally of all time. We simply didn’t “miss” any of these migrants before the project got underway.
Bald Eagles set a new all-time record this season.
However, as the season progressed, spring still didn’t seem to arrive. Lots of unfavorable (for viewing birds at Bradbury Mountain) winds meant that viewing migrating hawks past this mountain was not optimal. Strong and cold west winds, for example, push birds towards the coast beyond our view, while persistent easterlies seem to shunt birds inland before they reach the northern terminus of the coastal plain. Simply put, the poor conditions during the peak of our migration period in mid to late April really lowered the overall numbers and it’s those couple of weeks that can really make or break the overall count for the season. Therefore, the below-average numbers of our two most abundant migrants (Broad-winged Hawk and Sharp-shinned Hawk) combined to yield a below-average season total.
However, we had some great birds once again, highlight by our 4th record of a Golden Eagle.
Andrew also recorded a new record of 3 Rough-legged Hawks, no doubt due to the late onset of the spring’s flight (most Rough-legs probably move north before the start of the count in most years).
Meanwhile, a total of 85 species were recorded, including an ever-increasing number of Sandhill Cranes. This year a total of 11 migrant cranes were recorded. Other highlights included frequent visits by Bohemian Waxwings to the summit for much of the first half of the count, both Red and White-winged Crossbills. Fox Sparrow was recorded at the summit for the first time as well (two dates).
But, this hawkwatch is not just about the numbers. We also work hard to educate visitors to the park, both birders and non-birders. Every year we expose more and more people to the world of hawkwatching and bird migration in general. Bradbury Mountain is just one of many hawk migration sites throughout the continent. The data we collect becomes part of this vast network allowing researchers to determine population and geographical trends in particular species. So, even though our numbers this year were low relative to past seasons, it becomes no small part of building this data set. 1174 visitors were recorded at the hawkwatch (tabulated as coming specifically for the hawkwatch or spending time chatting with the counter), plus many hundreds more who at least briefly read the sign or asked a question or two. This was slightly below average, but likely due to the cool conditions for most of the season.
There are few public projects where scientific data collection so effectively goes hand-in-hand with public outreach and education. With the growth of regular hawkwatch visitor volunteers, and especially the growth of the “Feather Over Freeport: A Birdwatching Weekend” festival, we look forward to many more years of introducing people to hawkwatching and hawk research and conservation.
Turkey Vulture 374
Bald Eagle 102*
Northern Harrier 101
Sharp-shinned Hawk 610
Cooper’s Hawk 85
Northern Goshawk 4
Red-shouldered Hawk 104
Broad-winged Hawk 1190
Red-tailed Hawk 236
Rough-legged Hawk 3*
Golden Eagle 1
American Kestrel 307
Peregrine Falcon 8
Unidentified Hawk 46
*Denotes new season record
Peregrine Falcons just eclipsed our annual average this year; most migrants in this area stick closer to the coast.
Our ninth Spring Hawkwatch kicks off again on March 15th, 2016! We invite everyone, whether seasoned veteran hawkwatchers or casual nature enthusiast, to join our professional biologist and naturalist at the summit once again.
Ospreys are a fan favorite at the hawkwatch.
It was quite a change in climate and the color of the scenery since the start of the count!
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