Frank the Heron 
come in again and cover everything up 
once more. As the water advances, they 
are driven higher and higher, until, when 
there is no more standing room, they fly 
off somewhere else to wait for the ebb. 
This goes on by night as well as by day. 
On the darkest nights these mud-banks, 
and sand-banks, and beds of tidal ooze, 
are explored thoroughly by hosts of 
hungry birds, which depend upon the 
flowing and ebbing tides for their daily 
food. 
