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
Simply send them a letter (with proof of delivery) using the contact information found on your credit report. Generally they have 30 days to investigate and get back to you, or the information must be removed.
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).