[wisb] UW Arboretum - Eastern Bluebirds vs Tree Swallows?
- From: "Charles Henrikson" <ckhenrikson@xxxxxxxxxxx>
- To: "Wisconsin Birding Network" <wisbirdn@xxxxxxxxxxxxx>
- Date: Thu, 1 Apr 2010 17:17:36 -0500
Birders, As Molly and I said yesterday, the Tree Swallows have just arrived in the arboretum in large numbers. Today as I walked through Longenecker Garden I observed a pair of Tree Swallows sitting atop almost every bluebird house. At the bluebird house next to the parking lot and Curtis Prairie there were two Tree Swallow on top of the house and a male and female Eastern Bluebird nearby flapping their wings and chirping as if upset. The male bluebird flew toward the house several times and was chased away by one of the Tree Swallows. The Eastern Bluebirds arrived two to three weeks ago and have had no problems with other birds using/wanting their houses. Now that the Tree Swallows have arrived there seems to be great competition. Do the swallows drive the bluebirds away or can the bluebirds hold their own or is it about 50:50? There are many more Tree Swallows than Eastern Bluebirds in the arboretum right now. Another question -- Several years ago I visited the Minnesota Arboretum and took a guided tour. I noticed that bluebird houses were set out in pairs maybe 10-20 feet apart. That seemed strange so I asked why. The guide said that because of the competition between Tree Swallows and Eastern Bluebirds by setting out pairs of houses the swallows use one house and the bluebirds use the other. As long as there are separate species in each of the pairs there doesn't seem to be a problem with sharing the territory. If one species were in both houses then there would be territorial problems. Has anyone ever heard of this setup before and if it works why isn't this strategy used more often? My ebird report of species seen today is appended below. It's not very different from yesterday although I really enjoyed seeing a pair of Wood Ducks at the Big Spring and watching a pair of Yellow-bellied Sapsuckers chasing each other all over the place in the red pines. It's definitely that time of year. Good birding to all, Chuck Henrikson Madison, Dane County 1 Canada Goose 2 Wood Duck 7 Mallard 20 Wild Turkey 2 Sandhill Crane 3 Mourning Dove 1 Red-bellied Woodpecker 3 Yellow-bellied Sapsucker 1 Hairy Woodpecker 1 Northern Flicker 2 Eastern Phoebe 5 Blue Jay 5 American Crow 25 Tree Swallow 8 Black-capped Chickadee 2 White-breasted Nuthatch 6 Eastern Bluebird 30 American Robin 5 Fox Sparrow 5 Song Sparrow 4 Dark-eyed Junco 20 Northern Cardinal 28 Red-winged Blackbird 5 Common Grackle 4 Brown-headed Cowbird 6 House Finch 7 American Goldfinch 2 House Sparrow Total species reported: 28 #################### You received this email because you are subscribed to the Wisconsin Birding Network (Wisbirdn). To UNSUBSCRIBE or SUBSCRIBE, use the Wisbirdn web interface at: http://www.freelists.org/list/wisbirdn. To set DIGEST or VACATION modes, use the Wisbirdn web interface at: http://www.freelists.org/list/wisbirdn. Visit Wisbirdn ARCHIVES at: http://www.freelists.org/archives/wisbirdn.
Other related posts:
- » [wisb] UW Arboretum - Eastern Bluebirds vs Tree Swallows? - Charles Henrikson
- » [wisb] Re: UW Arboretum - Eastern Bluebirds vs Tree Swallows? - Kent