It looks they harvest rice only once in early autumn. That plant is strong enough to grow again, while no sparrows come to sip milk from the ears. They might be empty or too small to feed little birds. If the first, tasty harvest results from agricultural efforts including pesticides and fertilizers, the second one symbolizes what it is by right, doesn’t it? Our ancestors have tampered with the nature to eat more. We currently try to eat less for good health.