Webb said that the bird is hurt but recovering, and birds often come into his care with damaged feet because kahawai and kingfish will try to snag onto them.
"He's got some sore legs, he's probably strained himself when he came in."
The bird is a juvenile and has not yet grown the distinctive very long central tail feathers, which will eventually double the bird's total length.
The tropic bird is currently still recovering, it rotates its wings backwards when lifted into the air, which Webb explained is a sign it isn't ready to be released yet.
"When they are ready to go their wings roll forward and they stand up higher."
"These are the little things we have learned over the years."
Webb said he will likely free the bird at Poor Knights, away from humans and predators, when it is ready to be released.
New Zealand Birds online states that, "about 20 white-tailed tropic birds have been found beach-cast in New Zealand, all from the northern North Island, with the southernmost in Taranaki. Most were juveniles or immature, and most were found in summer."
Last year, a rare Indian Ocean yellow-nosed mollymawk was found in Northland and taken into care by Webb, but it unfortunately died and is now on display at Te Papa due to its rarity.