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C. A. Langtimm, T. J. O'Shea, R. Pradel, C. A. Beck, Estimates of Annual Survival Probabilities for Adult Florida Manatees (Trichechus manatus latirostris), Ecology, Vol. 79, No. 3 (Apr., 1998), pp. 981-997
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Langtimm et al. (1998) studied this question.
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