There appears to be a bug in the bear class:
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
at java.util.ArrayList.RangeCheck(Unknown Source)
at java.util.ArrayList.get(Unknown Source)
at bear.act(bear.java:38)
at greenfoot.core.Simulation.runOneLoop(Simulation.java:200)
at greenfoot.core.Simulation.run(Simulation.java:129)
This basically means you're trying to access the first element in an arraylist that contains no elements on line 38 of your bear class.
Nice idea, but it takes the computer quite a while to make a move and it's really difficult to visualise at the moment (at least I found it like that.) That said, without making it 3D I don't think there's a huge amount that can be done on the visualisation front!
There's a problem with your sounds that's causing it to crash:
java.lang.IllegalArgumentException: Format of sound file not supported: Slurp.wav
at greenfoot.Greenfoot.playSound(Greenfoot.java:141)
at Crab.act(Crab.java:74)
at greenfoot.core.Simulation.runOneLoop(Simulation.java:200)
at greenfoot.core.Simulation.run(Simulation.java:129)
Caused by: javax.sound.sampled.UnsupportedAudioFileException: could not get audio input stream from input URL
at javax.sound.sampled.AudioSystem.getAudioInputStream(Unknown Source)
at greenfoot.sound.SoundClip.open(SoundClip.java:70)
at greenfoot.sound.SoundClip.play(SoundClip.java:127)
at greenfoot.sound.SoundPlayer.play(SoundPlayer.java:144)
at greenfoot.Greenfoot.playSound(Greenfoot.java:135)
... 3 more
Try opening them in Audacity and then exporting to wav using the default settings, that should output it in a supported format.
2009/1/28
little-crab von L?on
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little-crab
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poppi_jump
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myWorms
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nDOX
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Princess-of-Cibinong2
2009/1/21
Princess-of-Cibinong2
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Princess-of-Cibinong2
2009/1/20
Lobster