DNS Nest Box Maintenance

Bird Nest Boxes in Boundary Bay Regional Park

The Delta Naturalists Society maintains about 30 Bird Nest Boxes in Boundary Bay Regional Park.  These are primarily for Tree Swallows.  There is also one Barn Owl box in a remote area of the park.

Twice a year we monitor the boxes.  In the Fall we open the boxes to see which ones have been used for nesting and by which species.  We clean-out the boxes and either leave them open or plug the openings for the winter.  This is done so that rats and wasps do not use them.  In the Spring we open and repair them as necessary.

We are trying to encourage Tree Swallows, which like other insect-eating birds, are declining world-wide.  This may be due to habitat loss, pesticide use, changes in insect populations and competition from non-native species like the European House Sparrow.  We have tried to discourage House Sparrows by decreasing the size of the opening. Some boxes are in wooded areas to encourage use by the native Black-capped Chickadees.

We record which boxes have been used by each species.  Tree swallow nests are usually neat and thin and made of grass and duck feathers.  House Sparrow nests are thick and messy and made of grass and duck feathers.  Chickadee nests are made of moss and hair. Some boxes have more than one nest on top of each other.

In 2012, 15 boxes were occupied – 2 Swallow, 9 Sparrow, 2 Chickadee, 2 double (Swallow/Sparrow).

In 2013, 6 boxes were occupied – 2 Swallow, 3 Sparrow, 1 Chickadee, 25 empty. (So many were empty because baffles had been put on most to reduce the opening size so that Sparrows could not fit. Swallows must have had trouble too. Most of these were removed for the next year.)

In 2014, 16 boxes were occupied – 4 Swallow, 11 Sparrow, 1 double (Chickadee/Sparrow), 15 empty.

In 2015, 20 boxes were occupied – 8 Swallow, 9 Sparrow, 3 Chickadee, 11 empty.

In 2016, 23 boxes were occupied – 9 Swallow, 10 Sparrow, 2 Chickadee, 2 double (Swallow/Sparrow), 6 empty.

Nest boxes Top species
Location Tree swallow Chickadee House sparrow Empty Box not checked Missing – does not exist Grand Total
Boundary Bay 11 1 11 5 3 31
Earthwise 2 6 2 1 11
Kings Links 40 3 6 3 52
Tatsu Shores 4 4
#N/A 1 1
North 40 1 1
Grand Total 51 6 11 18 13 1 100

bbrp_nestbox_data_compare 2012-2017.doc compares nestbox data from 2012-2016
bbrp_nestbox_data_2016-10-06.docx occupancy & repair status of nestboxes (Oct. 2016)
bbrp_nestbox_map.pdf map of nestboxes in BBRP (Oct. 2016)

Below are links to Reports about Bird Box maintenance.

BBRP Nestbox Report-Fall 2016 Oct. 6, 2016.  Fifteen Delta NatureKids and their parents joined some Delta Naturalists when the boxes were opened and examined.

Delta Naturalists’ Program helping birds find a place to nest at Kings Links Apr. 29, 2016 article in Delta Optimist by Dave Willis, about bird nest boxes at Kings Links

BBRP & Earthwise Nestbox Report-Spring 2016  March 3, 2016, by Tom Bearss

DNS Barn Owl Box “Tour” at King’s Links, November 12, 2015, by Tom Bearss

Nestbox Inventory 2015-11-05, November 2015, by Jack MacDonald

BBRP Nestbox Review-Fall 2014, November 7, 2014 by Terry Carr

Kings Links GC Nestboxes 2014, July 27, 2014, by Tom Bearss

Barn Owl Nestbox Report, March 27, 2014 by Tom Bearss

BBRP Nestbox Report-Spring 2014, Feb. 25, 2014, by Tom Bearss

BBRP Nestbox Review-Fall 2013, Oct. 8, 2013, by Tom Bearss

Barn Owl Box installed in North Forty Park, Oct. 8, 2013

Delta Nats BBRP Bird Box Program, Sep. 13, 2012

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