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[First paragraphs…] Petrels and albatrosses (Procellariiformes) exhibit features of extreme K-selection, with low annual reproductive output, long lifespan, and (typically) extremely delayed sexual maturity (Warham 1990). Diving petrels are, however, exceptional in the group in their relatively quick maturation. Some diving petrels return to natal colonies when only 1 year old, and most start breeding at only 2 or 3 years old (Richdale 1965; Marchant & Higgins 1990; Warham 1990; Miskelly & Taylor 2004). Common diving petrels (Pelecanoides urinatrix) have recently become re-established as a breeding species on Mana I (217 ha; 41°06´S 174°46´E) off the west coast of Wellington, southern North I, New Zealand, as a result of chick translocations, acoustic attraction, and natural re-colonisation (Miskelly & Taylor 2004; Miskelly et al. 2005). Diving petrels returning to, and colonising, Mana Is since 1997 have been monitored frequently (Miskelly & Taylor 2004; Taylor & Miskelly 2007). In addition to 118 chicks that fledged after being transferred from colonies elsewhere, 38 parent-reared chicks were banded at the main study colony on Mana I between 1999 and 2005. Of the 156 chicks, 31 had been recorded back at the colony by the end of 2005. Most returning chicks were first captured at 1 year old (n = 12) or 2 years old (n = 14).