If disaster should befall the larger chick the parent can switch to feeding the youngest and it will exhibit a constant growth curve from the day of active feeding. From Wikipedia
Depends, a repo stays on credit for 7 years, and a bankruptcy stays for 11 years, after you have paid off a debt and they have received payment it should be taken of immediately, but you may want to get a free credit report and check and if it is still there call them and ask them about it.
A paid tax lien can remain on your credit reports for up to 7 years from the date the government filed it, but you can speed up that timeline if you qualify for a lien withdrawal or the IRS Fresh Start program (you can learn how to apply on the IRS website).