Adult males have thin bills and are bright turquoise-blue and somewhat lighter underneath. In case the ranges overlap, it is best to use a 1 9/16” hole. a suitable size entrance hole that will keep out bigger birds, without rough edges (round 1.5" diameter hole for Eastern Bluebird [EABL], or 1.375" x 2.250" oval hole, or 1 3/16" high slot opening. Mountain Bluebirds need an entrance hole of 1 9/16” while Western Bluebirds use a 1 ½” hole. Oval holes should only be used in Eastern Bluebird boxes with moderate to small dimensions to reduce the possibility of Starling use. Mountain and Western Bluebirds need a 1 9/16" hole, and EABL like that size too.) Adult females have duller blue wings and tail, grey breast, grey crown, throat and back. Population number. Mountain, western, and eastern bluebirds compete for nesting boxes in places where their ranges overlap. The hole size for a bluebird house plan differs as compared to a birdhouse for chickadees. Hole diameter: 1½" for Western Bluebirds 1⁹/₁₆" for Mountain Bluebirds ¼" vent pivot Side nails View latch nail recess floor 11½" Side Side Top Bottom Back 10 Front ½" 14" 6½" 5" 5" 5" 9" 2½" 7" 82° ° 10 ¼" 11 ¼" 10 6½" ¼" 9" ³/₁₆"-deep rain groove When building a birdhouse or nestbox, the hole size (entrance) is one of the most important decisions you will need to make.Do you know that the diameter of the hole determines which birds will fit into the house and which birds will leave it alone? Hole size, nest area size and ... No perch should be attached to the front of the box, for this may encourage house sparrows, which are undesirable competition. Larger holes or slots allow starlings to enter. European starlings, House sparrows, and House wrens are also fierce competitors with bluebirds for nest sites. Entrance holes should be 1 ½ inches in diameter for eastern bluebirds and 1 ⅝ inches for mountain and western bluebirds. Visit & Look Up Quick Results Now On! It has a light underbelly and black eyes. According to the What Bird resource, the total number of the Mountain bluebird population is 5,200,000 individuals. One major difference between making a bird house for Eastern Bluebirds versus one for Mountain or Western Bluebirds is the entrance hole size. It’s also crucial making the appropriate size hole to exclude undesirable bird species. If the entrance hole is too large you might find less desirable birds are using your birdhouse. Search Bluebird House Hole Size. The mountain bluebird (Sialia currucoides) is a small migratory thrush that is found in mountainous districts of western North America. For example, a birdhouse plan with a hole size of 1 1/8 inch in diameter can exclude house sparrows and starlings, monopolizing nest boxes and evicting more desirable bird species.

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