You may have noticed the whistling calls of Baltimore orioles the past month or so. Now they're quieting down. That's because the males have their territories mapped out, the females have built nests, and the males will wait for eggs to hatch while not giving away the nest's location. Adult males are brilliant black and orange, while the females are a mango tone with blackish-brown wings. Their nests typically cling to an overhanging branch between 20 to 30 feet high. They are woven from fine, stringy material first, strung around branches to make the frame for a cupped structure into which the eggs are laid. Often we don't see these nests until the leaves drop in fall. Then we wonder "how could I have missed that?" Well, evolution teaches many tricks, and orioles mastered them all.