The Chatham petrel is capable of fast, agile flight. It forages mainly in the open ocean (7), and its diet, although not well understood, is thought to include fish and squid (4) (7).
The breeding season lasts from November until June (7). The Chatham petrel returns to land from November, laying a single white egg between December and February. The egg is incubated for six to eight weeks, and the male and female Chatham petrel both contribute to incubation and chick raising (7). The chicks fledge between May and June (8).
The Chatham petrel usually forms a pair bond which it maintains from year to year, although disruptions to pair bonding can occur, for reasons not well understood (7). Individuals do not usually breed until five years old, although breeding has been recorded as early as age three (4).