You've got double quotes around the entire string in the concatenation loop. Not good.
$execute.='$str=~/'.$animal.'/ && ';
You're removing the first && when you try to chop the last one.
$execute =~ s/ && $//;
Both of these can be more succinctly fixed with map and join. But anyway...
You need to simple eval the expression:
if (eval $execute) (Oh, and change the closing bracket).
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