RATS AND OPOSSUMS CAUGHT ON GATUN LAKE 
(A) Spiny rat; the quill-like hairs on back are probably used for defensive purposes. 
(B) Big gray opossum; this is the largest species found in Panama, variable in colors; the 
average men of young found with parent was seven. (C) Rat- tailed opossum, a medium- 
sized species. (D) Murine opossum, a very small species, the size of a ground squirrel. 
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