Hirundines

BTO Birdtrack (http://blx1.bto.org/birdtrack/main/data-home.jsp) has a feature on the home page for checking weekly reporting rates of a species in the current year against historical average reporting rate for the same week of the year. Typing in Swallow, House Martin and Swift (the rogue non-hirundine) all show a lower than average reporting rate for much of the 2016 summer, but interestingly reporting rates for all three of these species have just this week been back to typical levels - higher productivity/fledging? Sand Martin has been very different to the rest and is seeing higher than average reporting rate this year.

Posted July 8th, 2016 at 10:34 am by Lowell Mills in General Birding