There is a Royal Albatross colony at Taiaroa Head, New Zealand, which I have watched for a couple of years.
These birds lay only one egg, giving them the potential for only one chick per year. They are extremely endangered.
From the site:
The first egg was laid on 31 October 2009 and we had 17 albatross eggs in total. A major milestone was achieved in January 2010 as 100% of the fertile eggs produced successfully hatched - a first in 16 years. Another fact that is generating a lot of media interest this year is that there are two 'mums' who have formed a pair bond and are raising a chick.
During the next few months, the chicks will have to cope with heat, humidity, the risk of fly strike and predators. For the next six weeks, their parents will take turns guarding and feeding their chicks. They will then be left unattended while both parents forage at sea for enough food to feed them.One of the parents with a very cute chick:
http://www.albatross.org.nz/webcam/webcam.html