John and Bob now hurried to the window and looked out.  In the moonlight they could distinctly see a huge reptile, either a python or a boa-constrictor, coiled up in the angle formed by the juncture of the airplane body and the broad base of the left wing.  The creature was so long that its tail passed up over the rounded fuselage and out upon the other wing.  Bob flashed his electric pocket lamp upon it, and by the yellow and brown mottled spots upon its body and the double plates of whitish scale at its tale, and the wicked-looking triangular head, they were sure it must really be a python, one of the most dreaded of African snakes.  These creatures think a monkey a very choice morsel of food, and undoubtedly it had been attracted to the airplane, while it stood in the grass, by the appearance of Grandpa in the open cabin window, but had been frustrated in its designs by the return of the flyers and the sudden rising of the machine.