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.

Friday, May 14, 2010

May 14 [Day 81] (Valley View site) It was much more pleasant looking up at the snow covered ridge from the valley floor where the temperature reached 19C at 1500 from a low of 5C and remained at 17C at 1900. Ground winds were calm to light variable in the morning and W-SW occasionally gusting to 25 km/h in the afternoon, and ridge winds were W-WNW light to moderate to noon and moderate thereafter. Cloud cover was initially 80% altocumulus and cirrus diminishing to 5% at 0900 but then increased to 50-80% cumulus for the rest of the day providing excellent observation conditions. The first migrant raptor was an Osprey at 0945 and thereafter birds moved sporadically throughout the day with 5 of the day’s 12 migrants occurring between 1813 and 1902. The flight comprised 1 Osprey, 1 subadult Bald Eagle, 1 juvenile Northern Harrier, 2 Sharp-shinned Hawks (1a,1u), 1 light morph Swainson’s Hawk of unknown age, 3 calurus Red-tailed Hawks (2 light morphs (1j,1u) and 1 adult dark morph) and 3 juvenile Golden Eagles. The total bird count was a season high 39 species and for the first time bird song was strong both in the morning and evening. A 1st summer-plumaged Trumpeter Swan flying high above the Piitaistakis Ridge at 1110 was the season’s 76th bird species and a first record for May, and a male American Goldfinch was species #77. At 0855 two female American Three-toed Woodpeckers alternately drummed on opposite sides of a snag and were occasionally very vocal while a male bird was perched some way away. Was this female competition for a nest site (and/or for the male)? Despite the warm conditions a Clouded Sulphur was the only butterfly seen on the wing, but in the afternoon Mollie brought us a beautiful large saturniid moth that she had found nearby that was probably a Glover’s Silk moth (Hyalophora columbia gloveri). 12.16 hours (927.1) OSPR 1 (20), BAEA 1 (390), NOHA 1 (16), SSHA 2 (70), SWHA 1 (2), RTHA 3 (111), GOEA 3 (2167) TOTAL 12 (2972)

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