Starlings can be excluded from entering nestboxes boxes by using the correct size entrance hole, but will out-compete bluebirds for woodpecker holes and other natural nesting cavities.During the summer, bluebirds feed mainly on insects. In the winter, they depend on wild berries.
1. (Geological Science) (of sedimentary rock, etc) composed of fragments of pre-existing rock that have been transported some distance from their points of origin. 2. (Biology) biology dividing into parts: a clastic cell. 3. (Medicine) able to be dismantled for study or observation: a clastic model of the brain.
Conglomerate is a clastic sedimentary rock that contains large (greater than two millimeters in diameter) rounded clasts.The space between the clasts is generally filled with smaller particles and/or a chemical cement that binds the rock together. Conglomerate can have a variety of compositions.As a clastic sedimentary rock it can contain clasts of any rock material or weathering product that is washed downstream or down current.The rounded clasts of conglomerate can be mineral particles such as quartz or they can be sedimentary, metamorphic or igneous rock fragments.The matrix that binds the large clasts together can be a mixture of sand, mud and chemical cement.he rounded clasts of conglomerate can be mineral particles such as quartz or they can be sedimentary, metamorphic or igneous rock fragments. The matrix that binds the large clasts together can be a mixture of sand, mud and chemical cement.