Took these on our trip to the Galapagos several years back. We were fortunate enough to get a chance to walk amongst these birds' nesting area as they are not too disturbed by people. Taken on North Seymour Island.
Both shots taken with Olympus E3 and 90-250.
The first is a closeup of a male with his pouch inflated. They do this to attract a female in a rather cool display. I was particularly happy with how well this shot held up to cropping.
The second shot is an immature taking a nap. I'm really pleased with the amount of detail captured by the 90-250 in this shot.