Calonectris is a genus of seabirds. The genus name comes from Ancient Greek kalos, "good" and nectris, "swimmer".

The genus comprises four large shearwaters. There are two other shearwater genera, Puffinus, which comprises 21 small to medium-sized shearwaters, and Ardenna with 7 larger species.

The species in this group are long-winged birds, dark brown or grey-brown above, and mainly white below. They are pelagic outside the breeding season. They are most common in temperate and cold waters. Like most other tubenose birds, they use a shearing flight technique to move across wave fronts with the minimum of active flight, but fly with a more relaxed, fluid, flexible wing action than the other shearwaters in Puffinus and Ardenna.

Calonectris shearwaters are long-distance migrants. The streaked shearwater disperses from its east Asian breeding islands throughout the western Pacific and into the eastern Indian Ocean. They come to islands and coastal cliffs only to breed. They are nocturnal at the colonial breeding sites, preferring moonless nights to minimise predation. They nest in burrows and often give eerie contact calls on their night time visits. They lay a single white egg. They feed on fish, squid and similar oceanic food. They will follow fishing boats to take scraps.

...