Birds diurnal

Black Tern

Chlidonias niger

The Black Tern is a master of the marsh, trading the typical ocean-dwelling lifestyle of its cousins for a life among the reeds. With its striking charcoal plumage and acrobatic flight, it is one of the most elegant visitors to freshwater wetlands.

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Quick Identification

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Size

Length: 9–10 in (23–26 cm); Wingspan: 22–26 in (57–66 cm); Weight: 1.8–2.1 oz (50–60 g)

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Colors

Breeding adults have a soot-black head and body with silver-grey wings and tail. Non-breeding adults and juveniles are mottled grey above with white underparts and a dark 'ear' patch.

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Key Features

Jet-black head and underparts during breeding season
Short, slightly notched tail
Erratic, moth-like flight pattern
White undertail coverts contrasting with dark body
Small, pointed black bill

When You’ll See Them

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Activity pattern diurnal

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Peak hours 6-10 AM, 4-8 PM

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Season May-August (Breeding season in Northern Hemisphere)

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Diet Primarily insectivorous during the summer, favoring dragonflies, damselflies, and flies. They also consume small fish, tadpoles, and crustaceans, especially during migration.

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Habitat Inland freshwater marshes, wetlands, and lake edges with plenty of emergent vegetation; coastal waters during migration.

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Behavior

The Black Tern is a social and highly active bird, often seen in small colonies. Unlike many other tern species that dive headfirst into the water for fish, the Black Tern is more of a surface-feeder. It performs a graceful, almost fluttering flight just inches above the water, deftly picking insects and small fish from the surface or even snatching dragonflies mid-air. They are remarkably agile, often changing direction in a split second to pursue prey.

During the breeding season, they are quite protective of their nesting sites, which are typically floating platforms of decaying vegetation. They are known to be vocal and will dive-bomb intruders—including much larger animals—to defend their territory. In the winter, their social nature continues as they migrate in large flocks to coastal areas, often resting on buoys or driftwood far out at sea.

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Camera Tips

To capture the Black Tern on a trail camera, placement is everything. These birds rarely land on solid ground, preferring to rest on floating logs, old muskrat houses, or specialized nesting platforms. If you have access to a wetland or pond, mount your camera on a post or a sturdy reed-base just a few inches above the water level, facing a known resting spot. A low-angle shot will provide a much more dramatic and intimate view of their unique plumage than a high-downward angle.

Because Black Terns have an incredibly fast and erratic flight style, your camera's trigger speed is critical. Set your device to its fastest possible trigger mode and use 'Burst Mode' to take 3-5 photos per trigger event. This increases your chances of catching a sharp image of the bird in mid-air. If your camera allows for sensitivity adjustments, set the PIR (Passive Infrared) sensor to 'High,' as these small birds may not always trigger lower-sensitivity settings from a distance.

Lighting is the biggest challenge with this species. Their dark feathers can easily lose all detail in bright midday sun, appearing as a black silhouette. Aim your camera North or South to avoid direct lens flare, and rely on the 'Golden Hour' (early morning or late afternoon) to bring out the subtle grey textures in their wings. If you are monitoring a nesting site, ensure the camera is placed at a respectful distance to avoid disturbing the colony; use a camera with a high-resolution sensor so you can crop the image later without losing clarity.

Similar Species

Species that look similar or are commonly confused with Black Tern.

Forster's Tern

Much larger and predominantly white with an orange-based bill, whereas the Black Tern is smaller and mostly dark during summer.

White-winged Tern

Very similar but has a shorter bill and striking white wing coverts that contrast sharply with its black body.

Frequently Asked Questions

Black Terns are most active during the daylight hours, with peak foraging occurring in the early morning and late afternoon when insect activity over the water is at its highest.

Unless your 'backyard' includes a significant freshwater marsh or large pond with emergent vegetation like cattails, you are unlikely to attract them to a standard bird feeder. Providing floating logs or nesting platforms in wetland areas is the best way to encourage them to stay.

During the summer, they mostly eat insects like dragonflies, damselflies, and beetles. They are also known to eat small fish and aquatic invertebrates which they pluck from the water's surface.

They are generally uncommon in typical suburban neighborhoods unless there is a protected wetland or large lake nearby. They are quite sensitive to habitat loss and prefer quiet, undisturbed marshes for breeding.

During the breeding season, it's easy: Black Terns are almost entirely black/dark grey, while Forster's Terns are white with a black cap. In winter, look for the Black Tern's smaller size, shorter bill, and the dark 'smudge' or patch on the side of the head.

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