190 r 



180 



60 



50 



O- 



Z> 



o 



a. 



o 



40 



CO 



Z 



30 



20 



10 



i~i l~l n , ; ,r~i ,,, n 

 5 6 7 8 9 15 25 



GROUP SIZE 



Figure 3. Group-size frequency distribution of manatees sighted during aerial surveys 

 from July through December 1979. n = 297 groups. 



12 



