Certainty

All the birds of the air fell a-sighing and a-sobbing,
When they heard the bell toll for poor Cock Robin.

The Death of Cock Robin nursery rhyme / folksong could be about the death of Robin Hood based on the shared name, a ritual death of a king, the death of William II or even the downfall of Robert Walpole's government (source Wikipedia)

This poor creature has died in Spring, a time of renewal and birth.