Down the grassy knoll
ewes trot to a low lush field:
lambs gambol behind.

I like this...the whole thought of spring arriving as we are heading into winter down under makes me a little jealous :) I don't hear the word 'knoll' too much these days and it was a pleasure to jolt my memory back. Slight suggestion...I'd change the last line around ...

behind, lambs gambol.

Just my thoughts...:)

Aww, I just love the lambs! So lovely!