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.
It can take as long as 90 days for your resolved debt to show up on your credit report and reflect on your credit score. Keep in mind though that there is no guarantee that the actions you take, like paying off debt, will immediately improve your credit score because there are so many factors affecting your score.