Brown boobies now build most of their nests from marine litter, with plastic making up 90.1% of the material they collect from the sea. On islands where shipwrecks lie nearby, the birds incorporate a noticeable amount of wreckage debris into their ground nests. These nests are situated in large colonies and consist of a mound of broken shells and vegetation that supports their two chalky blue eggs.
Brown boobies sometimes obtain food by stealing it from other seabirds, a behaviour known as kleptoparasitism. Both fledglings and adults have been recorded snatching prey while other birds are feeding, extending the tactic beyond occasional opportunism. Notably, they have been observed taking fish directly from great frigatebirds as the larger birds hand the catch to their own chicks.
The brown booby was first recorded in Great Britain in 2019, marking the species' appearance far beyond its usual pantropical range. By 2024 a total of fifteen further sightings had been logged, with six of those occurring in 2023 and three in 2024, indicating a clear northward movement. One individual even reached 59°21′N at North Ronaldsay in Orkney, the most northerly point recorded for the species.
Brown boobies are powerful and agile fliers, yet their take-offs and landings are notably clumsy. When leaving the ground they seek out tall perches that catch the wind, using the gusts to generate the lift they need. Strong breezes further aid this awkward launch, allowing them to become airborne despite their ungainly start. Once aloft they quickly gain speed and manoeuvre with ease.
They lay two blue eggs but normally rear only one chick; the younger hatchling often cannot compete and may be pushed out. The second chick is frequently unable to obtain food and is ejected by its sibling.
Sources
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In the warm, sun-kissed waters of the tropics, the Brown Booby glides effortlessly, its sleek, brown plumage glistening with a subtle sheen as it dives and weaves with precision, its piercing gaze scanning the waves for the telltale flash of silver that signals the presence of its prey. With a fluidity that belies its somewhat ungainly appearance on land, this master of the air and sea navigates its domain with a quiet confidence, its very existence a testament to the remarkable adaptability of life in the ocean's vast and mysterious realm. As it takes to the skies, its wings beat with a slow, powerful rhythm, a symphony of movement that echoes across the waves.
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