It sometimes pays to be small. The larger birds fell through the thin ice that formed on the surface of the pond. But the small Hakusekirei owned the "entire rink" then and played to their hearts' content.
Perhaps we shouldn't bewail some of our seeming shortcomings. In God's wisdom, they may be reason for "entire rinks" of joy being ours.
I wonder if the Wagtail--that's the English name for this bird--doesn't look around and wonder why the other birds don't join him; it seems they just don't know what they're missing out on.