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They compared the frequency and duration of play behavior in two bands of Hanuman langurs in habitats that differed in availability of food and water . The availability of winter habitat , particularly access to deciduous shrubs and trees , is likely the most limiting factor for the birds in this area . A student may consider taking a College 99 if preparatory course work has already been done and if his or her interests cannot be accommodated through regular or independent study within a department in the School of Arts and Sciences . Between the fifth and tenth weeks of the semester , students in the School of Nursing have the option to request withdrawal from a course if they obtain written permission from the course instructor and the Assistant Dean of Academic and Student Affairs . Successful training involved 1 ) the sudden bursting of the model predator from a box in association with a loud noise and recordings of hare-wallaby alarm calls or 2 ) a model that ' lept ' at hare-wallabies as they approached and a simultaneous squirt from a water gun . Computation Program offers students the opportunity to engage in a systematic , integrative program of study within the School of Arts and Sciences . Nicolaus et al. ( 1983 ) also paired the lithium chloride treatment with the painting of eggs in a study on crows to elucidate the role of conditioned taste aversions in the evolution of Batesian mimicry .