When starting out with bluebirds, it is important to know the difference between house sparrow nests and bluebird nests because house sparrows are not only invasive in North America, they fatally attack North American native cavity nesting birds like bluebirds, chickadees, tree swallows, and purple martins.
Population control is very important, and therefore knowing the difference between nest types is critical.
This video gives you ways to distinguish between house sparrow nests and bluebird nests and it talks about what to do when it's difficult to tell them apart.
There are a lot of pictures and examples to help guide you.
We have some other resources dedicated to house sparrow population management. You can find that on our playlist: https://www.youtube.com/watch?v=kSNj51oDQnM&list=PLoR39W2-IwG8n3gNevtBXNDSriw5iz_fx&pp=gAQB
Also, it's very important to be able to identify house sparrows from other birds. Here is a helpful video for that: https://www.youtube.com/watch?v=pmEEJDXjzHI&list=PLoR39W2-IwG8n3gNevtBXNDSriw5iz_fx&index=2
Visit www.nesthollow.com to learn more about bird care and backyard bird conservation.