ocr: TREE NESTS TREETOP COLONY Bi NESTING in trees, young birds protect Hundreds together ofgray in treetop berons their vulnerable from breed predators that cannot climb. Small colonies. Their droppings build in tree holes or sites often kill the trees in. that tree-nesters they nest that are concealed by leaves. Large birds such as herons cannot fly through dense foliage, SO they nest high in a - tree's crown.
