What difference can you spot Between an alligator and a croc Well first there's colours: light and dark Which help to set the two apart Or failing that try this for size: Open up those beady eyes And scan the length of your beast The alligator will be least Then last of all find jaw and snout For then you'll know just all about The rounded face - but don't reach in He'll snaffle your arm with a top-toothed grin