def spawnCrab(self):
'''Create a new crab within the spawn_rect'''
new_crab = Crab(self)
x = random.randint(self.spawn_rect.left, (self.spawn_rect.right - new_crab.rect.width))
y = random.randint(self.spawn_rect.top, (self.spawn_rect.bottom - new_crab.rect.height))
new_crab.setLocation(x, y)
self.crab_group.add(new_crab)
