The nonsense song goes, "Mares eat oats/ and does eat oats/ and little lambs eat ivy." Familiar stuff if you're a fan of David Lynch's "Twin Peaks" (1990-91).
We have an ivy problem in our back yard. It's encroaching from the forest where decades ago it had taken hold after several people planted it as decorative ground cover. Now, it's choking out the trees with its thick and intractable lianas.
The only lamb that could possibly tackle this creeping mess would have to be sent back to us from the future by Skynet.