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.

Thursday, March 25, 2010

March 25 [Day 37] (Valley View site) A cloudless sky at 0700 allowed the temperature to fall to -6C but it quickly rose reaching 13C at 1500 and was still 7C at 1900. Ground winds were light generally W-SW until 1400 after which they occasionally gusted to 25 km/h but also included periods of calm, and ridge winds appeared to be moderate SW-W all day. After a cloudless start, altocumulus and small lenticular clouds formed with thin cirrostratus giving hazy sunshine, and after 1500 the cloud thickened to 100% altostratus giving a rather gloomy end to the day, but observing conditions were good to excellent all day. Calm conditions again ensured that there was no early raptor movement with the first bird, a Golden Eagle, not recorded until 0959 and the early dynamic was similar to yesterday’s late movement with birds soaring near or over Bluff Mountain to the west before gliding north. Morning migration peaked between 1100 and 1200 at 23 birds, and in the early afternoon 29 birds were seen between 1300 and 1400, but thereafter movement slowed but was reasonably steady until 1924 when the last Golden Eagle went north. The combined species total of 122 is the 3rd highest of the season so far, and involved 8 species of raptor which is the highest number so far, and the Golden Eagle passing at 1804 was the 2000th migrant raptor of the season. The flight comprised 5 Bald Eagles (2a,2sa), 1 adult female Northern Harrier, 2 unaged Sharp-shinned Hawks, a season high 8 Northern Goshawks (7a,1u), 2 adult Red-tailed Hawks (1 light calurus, 1 dark harlani), 1 light morph Rough-legged Hawk, 101 Golden Eagles (86a,12sa,2j,1u) and 2 Prairie Falcons. A flock of 20 Tundra Swans flew spectacularly overhead at 1312 and a total of 58 Canada Geese flew very high to the east over the Livingstone Range in 2 flocks. 12.58 hours (425.2) BAEA 5 (287), NOHA 1 (2), NOGO 8 (47), RTHA 2 (9), RLHA 1 (22), GOEA 101 (1623), PRFA 2 (8) TOTAL 122 (2010)

Mount Lorette [Day 25] (Joel Duncan) The temperature rose to a high of 11C at 1600 from a low of -2C at 1000, ground winds were calm to noon and SW 5-10 km/h in the afternoon, ridge winds were W light to1300 then light to moderate, and cloud cover was initially 10% cirrus increasing to 80% cirrostratus and altostratus by 1600. A total of 45 raptors migrated between a Golden Eagle at 1212 and 2 Golden Eagles at 1947 (the latest migrants yet at either site) with 15 of the day’s 34 Golden Eagles moving between 1500 and 1600 which included a single kettle of 8 birds soaring over Mount Allen to the west. The flight comprised 7 adult Bald Eagles, 34 Golden Eagles (22a,1sa,11u), 3 unaged Northern Goshawks and 1 large unidentified raptor. 10 hours (278.7) BAEA 7 (54), NOGO 3 (15), GOEA 34 (962), UU 1 (1) TOTAL 45 (1055)

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