Generally house sparrows and house wrens. Both are cavity nesters and will compete with bluebirds for nesting spots.
Yep! Bluebirds are birds and birds are animals.
Bluebirds - like all birds - are vertebrates.
Yes, bluebirds have predators. Foxes, cats, and raccoon may eat the eggs or live young out of the nest. Other birds such as sparrows compete with bluebirds for nesting places. Sparrows often break eggs and kill babies.
Bluebirds.
Since bluebirds are birds, they are born with feathers but they are a special kind called down.
Eastern bluebirds are very nice birds and eat many garden pests.
House sparrows and starlings often compete with bluebirds for places to build nests.
They hunt and search for it, usually on the ground. They eat mainly bugs but also fruits.
The house sparrow has many enemies. They must compete with other birds such as bluebirds for places to nest. Some of there other enemies include house wrens, crows, starlings, and even humans.
Sometimes bluebirds face competition with other birds over nesting sites. Another problem bluebirds have is a lack of natural habitat. In areas that are more developed there are less natural cavities for them to nest in.
They look like small hairless birds.
Sort of. Bluebirds reproduce and have "family" but it isn't like how we have families. The young birds grow up and fly away and later have no contact with their parents.