Glaucous-winged Gull

Fascinating facts about the Glaucous-winged Gull

• A glaucous-winged gull can drink saltwater without dying—their kidneys filter out 95% of the salt through a gland above each eye, excreting a brine three times saltier than the ocean itself. Most animals would die from this. Gulls have been doing it for millions of years.
• These gulls learned to follow fishing boats within the last 80 years, fundamentally reshaping their diet and population. What started as scavenging discards in the 1940s turned coastal gull numbers in the Pacific Northwest from hundreds to over 200,000 today—one of the fastest population booms ever recorded in a large seabird.
• A glaucous-winged gull chick is born covered in cryptic brown-and-grey down that makes it nearly invisible on rocky shores. It won't grow white feathers until it's 4 years old—one of the longest juvenile plumage stages of any gull species, a sign of how slowly these birds mature.
• Glaucous-winged gulls mate for life and return to the exact same nesting site every breeding season, sometimes for over 25 years. They remember their partner's call individually and will reunite within hours of arriving back at their island after months away.
• In the 1980s and 90s, glaucous-winged gulls began hunting and eating marbled murrelets—seabirds the size of robins—by the thousands along the Pacific coast. Scientists discovered the gulls had evolved a new hunting strategy in real time, switching from passive scavenging to active predation within a single generation.

At a glance

About the Glaucous-winged Gull

As the misty veil of dawn lifts over the rocky coastline, the Glaucous-winged Gull emerges, its sleek form slicing through the air with effortless elegance, its piercing cry echoing across the waves. With a subtle tilt of its wings, it rides the updrafts of warm air, a masterful navigator of the ocean's breezes, its feathers a mesmerizing mosaic of grays and whites that seem to shimmer in harmony with the sea itself. In its effortless gliding, we witness a testament to the gull's remarkable adaptability, a true monarch of the maritime realm.

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