Blue Petrel vs Balearic Shearwater
Halobaena caerulea compared with Puffinus mauretanicus
Side-by-Side Comparison
| Attribute | Blue Petrel | Balearic Shearwater |
|---|---|---|
| Scientific Name | Halobaena caerulea | Puffinus mauretanicus |
| Order | Procellariiformes | Procellariiformes |
| Family | Procellariidae | Procellariidae |
| Conservation Status | Least Concern | Critically Endangered |
| Length | — | — |
| Wingspan | 41.2 cm (16.2 in) | 48.4 cm (19.1 in) |
| Weight | 201.5 g (7.11 oz) | 514.8 g (18.16 oz) |
| Diet | -- | -- |
| Clutch Size | 1 | 1 |
| Population Trend | — | — |
Habitat Comparison
Conservation Status
Least Concern
Blue Petrel
Critically Endangered
Balearic Shearwater
About These Birds
Blue Petrel
26–32 cm, wingspan 60–71 cm. Blue-grey above with distinctive white-tipped square tail; white below. Resembles prions but tail pattern diagnostic. Breeds subantarctic islands (South Georgia, Crozet, Kerguelen). Ranges widely in Southern Ocean; feeds on crustaceans and small fish.
Balearic Shearwater
30–38 cm. Brown above; variably dirty-white to brown below; often shows brown smudging on flanks. Breeds only Balearic Islands, Spain. Critically Endangered with fewer than 3,000 pairs; faces extinction. Migrates to NE Atlantic; threatened by predators, fishing bycatch, and tourist development.