Provided by: xscreensaver-data-extra_5.45+dfsg1-2ubuntu1_amd64 
      
    
NAME
       thornbird - Bird in a Thornbush fractal.
SYNOPSIS
       thornbird  [-display  host:display.screen]  [-visual  visual]  [-window] [-root] [-count number] [-cycles
       number] [-delay number] [-ncolors number] [-fps]
DESCRIPTION
       Displays a view of the "Bird in a Thornbush" fractal.
OPTIONS
       -visual visual
               Specify which visual to use.  Legal values are the name of a  visual  class,  or  the  id  number
               (decimal or hex) of a specific visual.
       -window Draw on a newly-created window.  This is the default.
       -root   Draw on the root window.
       -count number
               Points.  10 - 1000.  Default: 800.
       -cycles number
               Thickness.  2 - 500.  Default: 16.
       -delay number
               Per-frame delay, in microseconds.  Default: 10000 (0.01 seconds.).
       -ncolors number
               Number of Colors.  Default: 64.
       -fps    Display the current frame rate and CPU load.
ENVIRONMENT
       DISPLAY to get the default host and display number.
       XENVIRONMENT
               to  get  the  name  of  a  resource  file  that  overrides  the  global  resources  stored in the
               RESOURCE_MANAGER property.
SEE ALSO
       X(1), xscreensaver(1)
COPYRIGHT
       Copyright © 2002 by Tim Auckland.  Permission to use, copy, modify, distribute, and  sell  this  software
       and  its  documentation  for any purpose is hereby granted without fee, provided that the above copyright
       notice appear in all copies and that both that copyright notice and  this  permission  notice  appear  in
       supporting  documentation.   No  representations  are made about the suitability of this software for any
       purpose.  It is provided "as is" without express or implied warranty.
AUTHOR
       Tim Auckland.
X Version 11                                   5.45 (08-Dec-2020)                                  thornbird(6x)