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American Focus > Blog > Tech and Science > How fish biologists discovered birds of paradise have fluorescent feathers
Tech and Science

How fish biologists discovered birds of paradise have fluorescent feathers

Last updated: February 25, 2025 4:35 am
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How fish biologists discovered birds of paradise have fluorescent feathers
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Birds of paradise are already known for their extravagant looks, with flashy feathers and fancy moves that have wowed both female birds and human bird watchers. But a recent discovery by a trio of fish biologists has shed light on a previously overlooked aspect of these stunning creatures – their ability to naturally fluoresce.

In a study published in Royal Society Open Science, researchers found that 37 out of the 45 known species of the bird family Paradisaeidae exhibit biofluorescence. This revelation marks the first comprehensive survey of biofluorescence in these showy birds, which are native to Papua New Guinea, eastern Indonesia, and eastern Australia.

The males of these species have evolved a variety of elaborate courtship displays, including long plumes, flexible wrists, pink fluff, ultrablack contrast zones, and pop-up blue-on-black smiley faces. These features enhance their courtship performance and help them attract mates in their natural habitats. The discovery of biofluorescence in birds of paradise adds another dimension to their already impressive array of colors and patterns.

Biofluorescence is a phenomenon where an organism absorbs light at one wavelength and re-emits it at a longer wavelength, creating vibrant colors and patterns. For example, intense blue light can be absorbed and transformed into greenish yellow light. While biofluorescence is common in some marine animals like seahorses and sharks, its presence in birds of paradise was unexpected.

By shining blue light on preserved museum specimens of birds of paradise, researchers were able to reveal the hidden biofluorescent patterns on their bodies. In the dark, feet, long feather streamers, eye-rings, mouth linings, and beaks of these birds emitted green or greenish-yellow light, adding to their already striking appearance.

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The researchers suggest that in the dense forests where birds of paradise live, high-energy blue and ultraviolet light can dominate the environment. This light can excite fluorescence in the birds’ feathers, enhancing their colors and making them stand out in their natural habitat. This discovery adds a new layer of complexity to our understanding of these enigmatic creatures and highlights the importance of further research into their unique adaptations.

Overall, the biofluorescence of birds of paradise adds a new level of intrigue to these already fascinating birds. Their ability to naturally fluoresce not only enhances their visual appeal but also sheds light on the diverse ways in which animals have evolved to survive and thrive in their environments. The vibrant colors and patterns of birds of paradise are a testament to the beauty and diversity of the natural world, and further research into their biofluorescent abilities may uncover even more surprises about these extraordinary creatures.

TAGGED:biologistsBirdsDiscoveredfeathersFishfluorescentParadise
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