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From 11 to 15 October 2009, we observed Yellow-rumped Warblers (Setophaga coronata coranata) foraging inside an unheated barn on 4 d, and inside a heated modern milking parlor on 2 d at a dairy farm in southeastern Saskatchewan, Canada. Warblers fed on dormant flies that were huddled on the walls inside of the barn and sallied for flies in mid-air and gleaned them from the window screens inside of the milking parlor. These observations were preceded by 2 d of unseasonable cold weather on 9 and 10 October, when maximum temperatures were below 0°C. Yellow-rumped Warblers fed indoors until 15 October after which the days became warmer, and we observed them only outside. Yellow-rumped Warblers most likely entered buildings to feed because unseasonable weather conditions increased their energetic demands and provided incentive for them to exploit shelter and food in novel places. [ABSTRACT FROM AUTHOR]

Bats of the temperate region of North America avoid winter by some combination of migration and hibernation at a location that provides the right conditions for minimizing energy expenditure over winter. Such optimal conditions are commonly found underground, and most of the best known hibernacula occur in caves or mines. Where winters are milder, some bat species hibernate in hollows in trees. Haida Gwaii, British Columbia, has the dual distinction of being relatively far north in terms of bat distribution, but with a relatively moderate oceanic climate. We hypothesized that because of the moderate winter temperatures, hibernating in trees could be an option for bats on Haida Gwaii. We used data loggers to monitor temperatures inside potential roost trees during 9 winters between 2002-2003 and 2012-2013. We found that mean winter temperature inside the trees ranged from 2.3-6.5°C, and in most years temperatures either did not drop below freezing or else did so only for short periods of time. We calculated that a 6 g bat would have required between 2.49-2.92 g of fat to hibernate in the tree roosts that we monitored, which is well within the limits that Little Brown Myotis (Myotis lucifugus) are known to accumulate in autumn. Our acoustic data demonstrated that California Myotis (Myotis californicus) were periodically active during all winter months except December, which we view as evidence that this bat hibernates locally either in trees or buildings. The absence of Little Brown Myotis, Keen's Myotis (Myotis keenii) and Silver-haired Bat (Lasionycteris noctivagans) observations during winter suggests that they may either use more common hibernacula, such as caves, or migrate off the islands. [ABSTRACT FROM AUTHOR]

After accounting for body size, bats have the longest lifespan of all mammals. Little Brown Bats ( Myotis lucifugus) are one of the most common and widely distributed mammals in Canada; however, little is known of their longevity. We captured bats in Cypress Hills Interprovincial Park, Saskatchewan in May 2015, as part of long-term bat research in the Park that began in 1991. On 31 May 2015, we captured 16 female Little Brown Bats in a maternity colony, including a bat that was originally captured and banded as an adult in 1993. This capture record indicates that the female bat was at least 23 y old and this record represents the oldest bat record in Saskatchewan. Little Brown Bats in eastern North America have declined dramatically due to white-nose syndrome, a fungal disease responsible for the quickest wildlife die-off in history. Pre-infection natural history data for Little Brown Bats are important as the disease spreads through central Canada. [ABSTRACT FROM AUTHOR]

The article presents study which investigates the song rate variation within individual Sprague's pipit (Anthus Spragueii). The study shows the association of high song rates with increased mating events, flock dominance, and increased offspring paternity. It notes that song rate variation within individual males indicates the influence of external factors to song rates. It points out that song rates vary with environmental conditions, breeding stage, and time of day. The results warrant further study in identifying factors may be attributed for the variation.