Monday, 20 March 2017

A New colony box in Magrath Avenue

We first installed a 4-box cabinet, made by Bob Tonks on Helen Hodgson's house in Magrath Avenue, Cambridge in 2010. Helen already had one pair of Swifts nesting on top of the wall under her eaves, but despite playing attraction calls every year, by 2016, still no Swifts have occupied her boxes.

Click to enlarge
Few places are as stubborn as this. More recently we installed 3 Zeist-style boxes further along the eaves, but although attraction calls generate interest from the Swifts, they are as yet to become established in any of the boxes.

In 2010 there was a small tree in front of the house, which has now become a substantial tree. Trees in front of boxes tend to slow things down. Although the tree has been trimmed somewhat over the winter, one can imagine that it is still a disincentive for the swifts.

So, as a last resort, we have installed a 4-box cabinet facing out over Magdalene College. It faces the same direction as the eaves which contains the existing pair of Swifts.

The space between the drainage pipe and the end of the wall is 29cm, so enough to get a floor area of about 26cm x 20cm for each chamber. The headroom in each chamber is 15cm

The front of the box faces south east, so it is painted white to reflect the sun. The box is made of 12mm weatherproof plywood, and the roof is covered in 9mm PVC.

Grooves were cut below the entrances to provide some grip. This might assist the Swifts in gaining their first entry.

The picture left shows how it was constructed. There is a tweeter in the 2nd chamber up.

The cabinet is secured to the wall with anchor bolts which screw directly into the brickwork, without a rawlplug.

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