Here's an alternative demo showing the use of towards():
###
def food(pos=[0,100]):
x,y=pos
old=position()
up();tracer(0)
goto((x,y))
down();circle(2);up()
goto(old)
down();tracer(1)
pos[0]+=10
print x,y
return x,y
reset()
bug=food()
while hypot(*[position()[x]-bug[x] for x in [0,1]])>4:
setheading(towards(bug))
forward(15)
clear()
bug=food()
write(' caught!')
done()
###
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