allet Young stands beneath a hogplum tree, peering up into the jungle canopy. He squints in the early morning sunshine, shading his eyes with one hand as he tries to locate a troop of black howler monkeys amid the leaves and vines overhead. After several minutes he spots six howlers sprawled on the tree's spreading branches and points toward them. Three pale strangers from Wisconsin look past his outstretched finger, eager to catch their first glimpse of one of the largest primates in Central America. Fallet cups his hands around his mouth and unleashes a harsh growling roar. No response. He tries again. With some coaxing, the dominant male responds with an ear splitting howl, ready to defend his territory against intruders. The two youngest monkeys, both less than three years old, clamber into another tree and begin grabbing roseapple blossoms. Wrapping their tails tightly around a branch to help them balance, they begin stuffing flowers into their mouths as quickly as they can pick them. With little regard for the audience below, the two howlers venture lower until they are only a few feet above the ground. The four older monkeys remain on the upper branches, feeding on the tender hogplum leaves.