When Predator Became Prey

I saw a willy wagtail yesterday His tail was switching every different way He darted from the fence line after flies And he had evil intent in his eyes. I watched him snatch a butterfly from play He stripped the parts he would not eat away He took the meat and left the wings behind And to suffering of others he seemed blind. But then i watched a 'hobby' flying by And he would not be chasing butterfly He grabbed poor willy carried him away And the predator had now become the prey. The legs wings or feathers hobby did not eat He only had the best of willy's meat I found one wing black feathers and his head And i concluded 'willy wag' was dead. In Nature it has always been this way The predator will end up as the prey And willy wag who ate the butterfly Was taken by a hobby flying by.