Hadhrat Dahhaak reports that Hadhrat Abu Bakr Siddeeq (r.a.) once saw a bird perched on a tree and said,
"How fortunate you are, O bird! By Allaah! I wish I had been like you.
You perch on trees, eat fruit and then fly off without (fear of) any reckoning or punishment. By Allaah! I wish that I was a shrub on the roadside that a passing camel takes into its mouth, chews and then swallows to eventually emerge as dung.
I wish I had never been a human (with worries of reckoning and punishment)."
Ibn Abi Shaybah, Hannaad and Bayhaqi
(From Hayatus Sahabah by Maulana Muhammad Yusuf Khandhlawi)