Forster'S Tern

Fascinating facts about the Forster'S Tern

• Forster's terns vanish from North America every winter — the entire breeding population abandons the continent and flies south to Central and South America, covering up to 9,000 km in a single migration. They time this exodus with the freeze: the moment inland lakes and coastal waters begin to ice over in autumn, they're already gone. No tern in North America travels farther.
• A Forster's tern can hover motionless above water for up to 10 seconds, beating its wings 20 times per second, scanning the surface below with laser focus before folding its wings and plummeting at 60 km/h into a dive so sharp it would dislocate a human shoulder. They hit the water at angles steeper than 60 degrees — the steepness of a ski slope — to catch fish mid-turn.
• Forster's terns see in ultraviolet light, which means they watch fish in the water create ultraviolet patterns invisible to human eyes — like a secret neon signal only they can read. This gift lets them hunt in murky inland lakes where other tern species struggle, giving them access to breeding grounds competitors cannot use.
• In 1973, Forster's terns breeding on the Great Salt Lake in Utah faced a crisis: a toxic algal bloom turned the water pink and killed their entire food source in weeks. The population crashed from thousands to dozens. Fifty years later, intensive conservation work and careful water management brought the colony back to over 3,000 birds — a rebirth from the edge of regional extinction.
• A Forster's tern chick takes just 20–25 days to fledge, but the real race begins after: parents chase their young into the air by withholding fish, forcing them to chase the parents and snatch food mid-flight. These aerial lessons teach chicks to dive and hunt in real time — a boot camp that lasts weeks before the chicks finally hunt alone and the family flies south together.

At a glance

About the Forster'S Tern

As the sun rises over the marshy wetlands, the Forster's Tern awakens, its sleek, grey form unfolding like a ghostly apparition, its wings beating with a mesmerizing rhythm as it takes to the skies. With an effortless glide, it dances on the breeze, its sharp, black-tipped bill slicing through the air as it pursues the tiny fish and crustaceans that dwell in the shallow waters below. In its fluid, aerial ballet, the Forster's Tern embodies the very essence of coastal elegance, a symphony of movement and light that is at once both captivating and serene.

Discover more wildlife