Species · accepted · checked 2026-08-05

Pterodroma cookii

Cook's Petrel

WoRMS 225943ITIS 554395key itis:554395

2026-08-05: worms_id 225943 via WoRMS TSN crosswalk (status accepted)

Silhouette · Anthony Caravaggi · CC0 1.0 · PhyloPic, drawn from Pterodroma

Cook's Petrel26 cm

bongo net ring71 cm

max · sealifebase

Cook's Petrel (Pterodroma cookii) — Photo · Aviceda at English Wikipedia (Original text: Tom (talk)) · CC BY 3.0 · commons

Cook's petrel or tītī (Māori), blue-footed petrel, is a Procellariiform seabird endemic to New Zealand. It is a member of the gadfly petrels and part of the subgenus Cookilaria Bonaparte, 1856, which includes the very similar Stejneger's petrel.W CalCOFI holds 1,931 observations of it in 1 dataset between 1987 and 2022.R

1,931
observations: 1,931
records: 1,931
sampling events: 1987–2022
years: 1
datasets

Observed in
i
One row per dataset, one cell per year, darker with more observations — the same strip the front door draws per dataset. Each row ends with the name that dataset uses (dataset_taxon); the accepted name is written once, in the title above. A quiet pill marks a name the authority does not accept.

Seabirds & Marine Mammals 1,931 obs · 1,931 events · 1987–2022
name used: Pterodroma cookii Cook's Petrel · code COPE

How big is it
i
Every mark is a measured length with its own source — hover one to read it. The reference objects are _data/size_reference.csv: two of them, the 505 µm bongo mesh and the net's ring, are CalCOFI's own sampling gear.

Groups

calcofi:seabirds

Ways in
i
Read from taxa.json of release v2026.09.11, written at release by calcofi4db::build_taxa_catalog(). The catalog's index is /species/.

Explorer db-query

ERDDAPCalCOFI's own server, the Seabirds & Marine Mammals table constrained to this taxon

https://erddap.calcofi.io/erddap/tabledap/farallon_bird-mammal.html?&taxon_key=%22itis:554395%22

Pterodroma cookii

How big is itiEvery mark is a measured length with its own source — hover one to read it. The reference objects are _data/size_reference.csv: two of them, the 505 µm bongo mesh and the net's ring, are CalCOFI's own sampling gear.

Groups

Ways iniRead from taxa.json of release v2026.09.11, written at release by calcofi4db::build_taxa_catalog(). The catalog's index is /species/.

How big is it
i
Every mark is a measured length with its own source — hover one to read it. The reference objects are _data/size_reference.csv: two of them, the 505 µm bongo mesh and the net's ring, are CalCOFI's own sampling gear.

Ways in
i
Read from taxa.json of release v2026.09.11, written at release by calcofi4db::build_taxa_catalog(). The catalog's index is /species/.