Connecticut Warbler

MacGillivray’s Warbler

Most birds who migrate north of the Lesser Slave Lake Bird Observatory to the tundra have already left and taken with them the peak of overall avian diversity for the year. Yet the nets still have some surprises for us including the 35^th ever (but ninth of spring) Connecticut Warbler and our fourth ever (second of spring) MacGillivray’s Warbler. Both these species look a lot like each other and also a lot like our locally common Mourning Warbler. The key differences are their songs and eye-rings: male Mourning Warblers have little to no eye-ring, MacGillivray’s have a broken eye-ring, and Connecticut’s have a full eye-ring. This is just one example o…

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