Overview
The Broad-billed Roller (Eurystomus glaucurus) is a dazzling, stocky aerial bird belonging to the roller family Coraciidae, widespread across the woodlands and savannas of sub-Saharan Africa and Madagascar. Famous for its heavy, bright yellow bill and rich cinnamon-and-violet plumage, it spends its days perched on exposed high vantage points before launching into breathtaking aerial acrobatics to pursue flying insects.
Biology and Physical Characteristics
Adult Broad-billed Rollers measure roughly 30 cm in length and possess rich, warm cinnamon-brown plumage on their mantle and back, paired with an iridescent violet-purple wash on the throat and breast. Their primaries and tail display intense azure-blue highlights visible when their wings spread in flight. The head is large with a strikingly broad, flattened bill of bright yellow with a black hooked tip, engineered for hawking hard-shelled beetles and insects on the wing.
Behavior and Ecology
True to the roller moniker, these birds perform spectacular rolling and tumbling aerial displays during courtship, swooping downward in rapid corkscrewing dives while uttering harsh, chattering calls. They are crepuscular hunters of termite emergences, gathering in dozens above forest clearings at dusk to gorge on swarming alates. They nest in unlined natural tree hollows or abandoned woodpecker cavities high up in dead tree trunks, defending the vicinity with aggressive aerial swoops.
Conservation and Human Impact
The Broad-billed Roller is classified as Least Concern on the IUCN Red List due to its expansive geographic range and stable global numbers. Although extensive deforestation and logging of old-growth trees deplete essential nesting hollows, the bird readily utilizes secondary forest edges, agricultural clearings, and savanna trees.
Interesting Factoid
Broad-billed Rollers possess exceptionally broad gapes that allow them to swallow heavy-armored beetles and giant cicadas whole while executing high-speed aerobatic maneuvers in mid-air.