The Piitaistakis (South Livingstone Ridge)and Mt. Lorette Raptor Counts for the spring migration of 2010 are underway. Follow the daily movement of raptors in these field notes by Research Director Peter Sherrington and his citizen scientist colleagues.

Monday, May 10, 2010

May 10 [Day 77] (Valley View site) It was a beautiful morning with a temperature of -4C at 0700, almost cloudless and calm, but at 0830 cumulus cloud started to spill over the Piitaistakis Ridge from the east and by 1000 all ridges were obscured with 100% stratocumulus cloud cover. The ridges began to clear around 1230 and were more or less clear by 1300. In the afternoon the temperature rose to 8.5C at 1600 with a cumulus cloud cover ranging from 60-80% allowing periods of sunshine, ground winds were light and variable while ridge winds were light to moderate ENE to ESE. The first migrant raptor, a subadult Golden Eagle disappeared into cloud at 1216 and by 1600 only 7 birds had been seen including the season’s first Broad-winged Hawk (an adult light morph) at 1343 [species #73] and the season’s second adult tundrius Peregrine Falcon at 1555. Between 1607 and 1654, however, there was a sudden spate of migrant raptors and the 17 birds seen was the highest hourly count since April 17, comprising 1 Osprey, 5 Sharp-shinned Hawks, 1 Cooper’s Hawk, 4 Broad-winged Hawks, 1 Red-tailed Hawk and 5 Golden Eagles. Subsequently only 4 more birds went north as hail and light rain showers developed, with the last bird being a juvenile Northern Harrier at 1851. The 8 Golden Eagles comprised 4 subadults and 4 juveniles, while the 5 Broad-winged Hawks was the highest spring single-day count for the site and included 2 dark-morph adult birds soaring together with an unaged light morph bird at 1640. 12.25 hours (978.2) OSPR 1 (15), BAEA 1 (386), NOHA 1 (15), SSHA 8 (59), COHA 1 (13), BWHA 5 (5), RTHA 1 (106), GOEA 8 (2152), AMKE 1 (2), PEFA 1 (2) TOTAL 28 (2920)

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