Leach's Storm-Petrel vs Louisiana Waterthrush

In short

Leach's Storm-Petrel is a seabird often seen over open oceans, while the Louisiana Waterthrush is a terrestrial bird found near streams. The most reliable field mark is their habitat: Leach's Storm-Petrel is never found inland, whereas the Louisiana Waterthrush is a forest streamside specialist. Additionally, the Waterthrush's constant tail-wagging behavior is distinctive.

Identification tips

• Habitat: Leach's Storm-Petrel over oceans; Louisiana Waterthrush near streams.
• Behavior: Look for the Waterthrush's tail-wagging.
• Plumage: Note the white rump of the Storm-Petrel vs. the streaked underparts of the Waterthrush.
• Vocalization: Listen for the Waterthrush's loud song near streams.

Size

Leach's Storm-Petrel is a small seabird, whereas the Louisiana Waterthrush is a small songbird, slightly larger than a sparrow.

Plumage

Leach's Storm-Petrel has a dark plumage with a distinctive white rump patch, while the Louisiana Waterthrush has brown upperparts and white underparts with bold streaking.

Behaviour

Leach's Storm-Petrel glides over the ocean with a characteristic bounding flight. In contrast, the Louisiana Waterthrush is noted for its constant tail-wagging and foraging along streams.

Habitat

Leach's Storm-Petrel is found over open oceans, rarely approaching land except for breeding. The Louisiana Waterthrush inhabits forested streams and is often seen walking along the water's edge.

Voice

Leach's Storm-Petrel is generally silent at sea, whereas the Louisiana Waterthrush has a loud, ringing song that carries over the sound of rushing water.