Tropical Shearwater vs Great Frigatebird

The Tropical Shearwater and Great Frigatebird are both seabirds but differ significantly in appearance and behavior. The Tropical Shearwater is a small, dark seabird with a more typical shearwater silhouette, while the Great Frigatebird is larger, with a distinctive forked tail and long wings. Observing their flight patterns and habitats can help distinguish them.

Look for the size and silhouette: Great Frigatebirds are much larger with a forked tail and long wings, while Tropical Shearwaters are smaller with a more compact body. Flight behavior is also key: frigatebirds soar effortlessly and rarely land on water, whereas shearwaters fly close to the water's surface. During breeding season, the male Great Frigatebird's red gular sac is a distinctive feature.

The Tropical Shearwater is much smaller than the Great Frigatebird. The frigatebird is one of the largest seabirds, with a wingspan that can reach over 2 meters, compared to the shearwater's more modest size.

Tropical Shearwaters are generally dark above with white underparts, typical of many shearwaters. In contrast, Great Frigatebirds have a striking appearance with a glossy black plumage and, in males, a bright red gular sac during the breeding season.

Tropical Shearwaters are often seen flying low over the water, engaging in pursuit-diving for food. Great Frigatebirds are known for their aerial prowess, soaring high and rarely landing on water, often seen harassing other birds for food.

Tropical Shearwaters are typically found in tropical and subtropical oceans, often near islands. Great Frigatebirds are pantropical, nesting on remote islands and spending much of their time over open ocean.

Vocalizations are not a primary distinguishing feature in the field for these species, but Great Frigatebirds are known for their whinnying calls during courtship displays.