Bluebird Eggs. Typically bluebirds lay fewer eggs in a clutch later in the season, as you observed. The number of broods depends on many factors, including weather and food supply.

Western bluebirds produce one to three broods per year, and mountain bluebirds tend to have just one or two.) Birds' gut bacteria might also play a role in the immune response, Knutie adds.

Bluebirds are most common in Central Massachusetts and the Connecticut River Valley, but can be found throughout the state, said Petersen. “The key is agricultural landscapes,” explained Petersen.

My bluebird expert has been feeding bluebirds for a long time. If you have had bluebirds overwintering in the boxes, I hope you've had a chance to use 2 to 3 inches wide by 2 feet long limbs this ...

How to prepare your nesting boxes for bluebirds: Nature News Susan Pike We have a large group of house sparrows that have taken over our front yard, especially the huge quince that provides thorny ...

Bluebirds don't carve out their own cavities; their bills are not intended for heavy work. Instead, they rely on woodpecker construction or natural decay of wood.

Bluebirds need a cavity for nesting, such as rotted holes in trees. But they don't like to be in the woods, where many of these natural cavities can be found, and prefer to be out in the open ...