Eurasian tree sparrows attack bluebirds in nest boxes, even killing them. Observations are limited since Eurasian tree sparrow populations are isolated in small areas. But limited observations and video evidence shows they are a threat to bluebirds.
Category: Sparrow Control
House Sparrow Nests
House sparrow nests are usually found in nest boxes or other types of cavities and are constructed using various nesting materials such as straw, grass, feathers, litter and fiber. Other characteristics of a house sparrow nest are its size and tunneling architecture.
How to Euthanize House Sparrows After Trapping
For US conservation purposes, you should euthanize house sparrows to prevent them from harming native wildlife. House sparrows should never be relocated. Humane methods of dispatch include cervical dislocation, using a pellet gun, CO2 and the blow method.
How to Tell a Bluebird Nest from a House Sparrow Nest – Complete Guide
Three primary ways to tell a bluebird nest from a house sparrow nest is shape, material and height. Bluebirds have clean cups of pine or straw that sits below the entry hole. House sparrows fill a box with no defined cup or consistent material. But in many cases you will still need other clues.
Eurasian Tree Sparrows Are Aggressive Toward Native Birds: Observations and Info
There is another nonnative sparrow in North America that is less familiar to us. This is the Eurasian tree sparrow, a cousin of the invasive and highly aggressive house sparrow.
Eurasian Tree Sparrows vs. the House Sparrow’s – Nonnative Twins
If you live in certain areas in the US, particularly St. Louis, MO, you didn’t see two male house sparrows in your birdhouse, you saw its invasive cousin, the Eurasian tree sparrow. There are distinct features such as a dot on the cheek and a full chestnut colored cap that can help you tell the difference. And both male and females have the same patterns.
Monofilament Line Kind of Deters Sparrows – Observations Included
In our experience observing multiple nest boxes, monofilament won’t keep sparrows from harassing the nest; however, there is still some reasons to use it.
Installing Monofilament On Your Birdhouse: Easy 5-steps with pictures
When installing monofilament line on your birdhouse, the most important thing is to place to vertical strings running down the front of your box just ⅛ of an inch from either side of the entrance hole.