Etymology of Barau's Petrel
The name commemorates Armand Barau, an agricultural engineer and ornithologist from the French territory of Réunion in the Indian Ocean. It is one of the most recently discovered species of seabird and was only described in 1964, although it was known to local people prior to that.
Structure of Barau's Petrel
Barau's petrel is around 40 cm long, and has white undersides and forehead. Its bill is black and its upper parts are dark, with a moderately distinct "M" pattern across the wings and back.
Concentration of Barau's Petrel
Barau's petrel ranges across the Indian Ocean from Reunion to Western Australia and Indonesia. With the exception of a single nest found on the island of Rodrigues the bulk of the population is thought to nest on Reunion.
Feeding of Barau's Petrel
Barau's petrels are highly pelagic at sea, preying on small fish (10 cm) by surface-seizing and plunge diving. They will associate with other species while feeding.
Breedings of Barau's Petrel
The colonies of Barau's petrel are unusual in being far inland and at high elevations; they dig burrows under the forest at around 2400-2700mteres above sea level. The breeding biology of the species has not been studied but it is inferred that they have a 55-day incubation period and take around 100-120 days to fledge a chick. Unlike most burrow nesting procellariids, Barau's petrels begin to return to their colonies diurnally, returning in the late afternoon and riding the thermal updrafts to conserve energy.
Chicks of Barau's Petrel
The chicks of Barau's petrel fledge between November and February. Sites which have been identified by BirdLife International as being important for the conservation of the species include the Grand Bénard- Tapcal and Piton des Neiges- Gros Morne Important Bird Areas (IBAs) on Réunion where breeding colonies exist.
Barau's Petrel as Endangered Species
Barau's petrel is considered to be an endangered species. It has a highly restricted breeding range and has suffered hunting pressure in the past. While the shooting of the species has now been stopped, and the population seems to have recovered, it is currently threatened by introduced species and light pollution. Young birds, particularly fledglings, are disorientated by artificial lights such as streetlights or the floodlights of sporting venues, which they mistake for bioluminescent squid, and lead them to fail reach the sea. It is estimated that as much as 40% of each breeding season's fledglings get confused in this fashion. Conservation organisations work with local people to catch disorientated chicks and release them back at sea, a program that is thought to rescue most of the lost chicks.