Kermadec Petrel vs Trindade Petrel

In short

Kermadec Petrel and Trindade Petrel are both medium-sized seabirds with similar jaeger-like plumage, but they can be distinguished by the presence of white shafts on the upper side of the primaries in Kermadec Petrel. Both species exhibit kleptoparasitic behavior, which can make field identification challenging.

Identification tips

1. Look for white shafts on the upper side of the primaries in Kermadec Petrel. 2. Observe behavior; both species may exhibit jaeger-like kleptoparasitism. 3. Consider location and range, though both species can overlap in pelagic zones.

Size

Both species are similar in size, typical of medium-sized petrels.

Plumage

Kermadec Petrel has white shafts on the upper side of the primaries, which is a key distinguishing feature. Trindade Petrel lacks this characteristic. Both species have a jaeger-like appearance, but plumage can vary with morphs, making color less reliable.

Behaviour

Both species are known for their kleptoparasitic behavior, mimicking jaegers in flight and feeding habits.

Habitat

Both species are pelagic and are often found in similar oceanic environments, making habitat a less reliable distinguishing factor.