Corky's back!  To talk to us about bats, bats, and more bats!  -- primarily the Mexican Free-tail Bat which is so plentiful under the I-80 freeway at the causeway.  Size, shape, habit -- all the things that one can know about these insect-devouring friends -- that's what Corky Quirk has for us today.  And then there are the mysteries that scientists still haven't learns.  The crack in the attached image is less than 2 inches wide.