{"id":73382,"date":"2021-01-04T00:01:07","date_gmt":"2021-01-04T04:01:07","guid":{"rendered":"https:\/\/blog.nature.org\/?p=73382"},"modified":"2023-01-29T00:59:54","modified_gmt":"2023-01-29T04:59:54","slug":"bowerbirds-meet-the-bird-worlds-kleptomaniac-love-architects","status":"publish","type":"post","link":"https:\/\/blog.nature.org\/2021\/01\/04\/bowerbirds-meet-the-bird-worlds-kleptomaniac-love-architects\/","title":{"rendered":"Bowerbirds: Meet the Bird World\u2019s Kleptomaniac Love Architects"},"content":{"rendered":"\n

It looked like a tiny shrine on the forest floor: Bare ground clear of debris. Two walls of sticks, bending towards one another. Blue feathers and bottle caps arranged in a wide arc. And a small plastic doll, splayed in the center of the structure, eyes wide and mouth open in a plastic scream. <\/p>\n\n\n\n

But this wasn\u2019t the scene of some pagan ritual in miniature. I\u2019d stumbled upon the bower of a satin bowerbird. <\/p>\n\n\n\n

Found throughout Australia and New Guinea, bowerbirds are famous for the elaborate and sometimes whimsical structures that males build to court females. These bowers are the largest and most elaborately decorated structure built by any animal \u2014 except humans. <\/p>\n\n\n\n

Some bowerbird species are exceedingly rare, or found in very remote or threatened habitats like the highland rainforests of New Guinea. But others are easy enough to find in Australia. I\u2019ve been lucky enough to see a few of them. And each time I encounter them, I grow even more fascinated by their ingenuity, and by the science behind their bower displays. <\/p>\n\n\n\n

\"bower
A satin bowerbird\u2019s bower, decorated with blue objects. \u00a9 Stefan Marks \/ Flickr<\/a><\/figcaption><\/figure>\n\n\n\n

Satin Bowerbird, Lover Of Blue<\/h2>\n\n\n\n

Satin bowerbirds are one of the most commonly encountered bowerbirds in Australia. They live in forest habitats along the east coast, venturing into gardens and backyards where human development abuts their preferred habitat. <\/p>\n\n\n\n

Male satin bowerbirds have rich, iridescent plumage that appears blue or black, depending on the light, and vivid royal-blue eyes. The females, which live in groups with a single male, have more subtle green and brown plumage that blends in with the vegetation. <\/p>\n\n\n\n

\"dark
A male satin bowerbird collects his prize \u2014 a blue bottle cap. \u00a9 Stefan Marks \/ Flickr<\/a><\/figcaption><\/figure>\n\n\n\n

I saw my first satin bowerbird at a national park picnic area, where the male approached me multiple times, bold and inquisitive. At first I assumed he wanted a piece of my lunch, but then I realized that my shirt was the exact shade of vivid blue that he collects to decorate his bower. <\/p>\n\n\n\n

Months later, I found a bower on the edge of Lamington National Park. The decorations scattered around the avenue of upright sticks were a homage to the Anthropocene: mentos wrappers, milk bottle tops, blue laundry pegs, blue hair ties, straws, cutlery, pen caps, and a few blue feathers and berries thrown in for good measure. <\/p>\n\n\n\n

Even near high-quality habitat, the bird still preferred human detritus that wouldn\u2019t fade or decay. Away from human settlement, bower decorations include blue flowers, berries, and the feathers of blue-colored birds.<\/p>\n\n\n\n

\n
\"blue<\/figure>\n\n\n\n
\"dark<\/figure>\n\n\n\n
\"dark<\/figure>\n<\/figure>\n\n\n\n

Male bowerbirds frequently sneak into one another\u2019s territory to steal trinkets and even destroy other bowers. Juvenile males take around seven years to reach maturity, during which time they practice building bowers, displaying to other young males, and working in gangs to steal from adults. <\/p>\n\n\n\n

Scientists studying this behavior discovered that the birds prefer to steal objects that reflect ultraviolet light<\/span><\/a>, like blue parrot feathers and milk bottle tops. (These coveted items are also dangerous, as birds can get them stuck around their heads<\/span><\/a>.)<\/p>\n\n\n\n

\"bower
A great bowerbird in Weipa, Queensland. \u00a9 Dan Armbrust \/ Flickr<\/a><\/figcaption><\/figure>\n\n\n\n

Great Bowerbird, Master of Optical Illusions<\/h2>\n\n\n\n

Another common Australian species is the great bowerbird, found across the top of Australia. Males and females look very similar, a drab grey-brown, but the males have a hidden crest of neon pink feathers on the top of their heads. Called a nuchal crest, they keep these feathers hidden unless they\u2019re trying to entice a female. <\/p>\n\n\n\n

Their bowers are quite similar to the upright stick avenue of the satin bowerbird, but the great bowerbird opts for a display court of grey and white, accented with red, purple, and green objects. <\/p>\n\n\n\n

These birds are quite comfortable around people; I saw my first one at a campground, bopping around its bower less than 6 feet from where we pitched our tent. He decorated with white cockle shells and bones, grey pebbles, a guitar pick, a green glass marble, and aluminum pull-tabs from soda cans. <\/p>\n\n\n\n

Meanwhile, another great bowerbird I spotted in a Townsville city park had a decidedly more urban collection of decor: duct tape, tin foil, a pink bra strap, purple ribbon, green cloth pegs, broken glass, candy wrappers, a baby-bottle nipple, purple flowers, green leaves, and \u2014 the pi\u00e8ce de r\u00e9sistance \u2014 a syringe.<\/p>\n\n\n\n

\n
\"brown
A male great bowerbird gathering sticks for his bower avenue. \u00a9 julie burgher \/ Flickr<\/a><\/figcaption><\/figure>\n\n\n\n
\"detritus
Great bowerbirds collect silver, red, green, and lilac objects. \u00a9 Justine E. Hausheer<\/figcaption><\/figure>\n\n\n\n
\"detritus
A syringe in a city bower. \u00a9 Justine E. Hausheer<\/figcaption><\/figure>\n\n\n\n
\"\"
\u00a9 Justine E. Hausheer<\/figcaption><\/figure>\n<\/figure>\n\n\n\n

To our eyes, these bower decorations might look like a random mess. But scientists decoded the great bowerbird\u2019s decor philosophy, discovering a sophisticated system of optical illusions. <\/p>\n\n\n\n

The basic bower structure is simple: an \u201cavenue\u201d of upright, reddish sticks with a semi-circular display court at each end. Curious female bowerbirds sit inside the avenue, and the walls limit their visual field. Then males pop their heads in and out to surprise them, and flick or wave colored objects across the female\u2019s field of view. <\/p>\n\n\n\n

Researchers from Deakin University discovered that bower materials alter the females\u2019 perception of color<\/a>. The reddish sticks help induce “chromatic adaptation,” which creates a more heightened experience of red, green and lilac colors. Not coincidentally, those are the exact colors great bowerbirds use to decorate their bowers, and the colors on their nuchal crest. <\/p>\n\n\n\n

\"brown
Great bowerbirds have pink crests used to attract females. \u00a9 Mark Gillow \/ Flickr<\/a><\/figcaption><\/figure>\n\n\n\n

When presenting prized objects to potential mates, males keep their multicolored objects out of sight, presenting one after the other to females in a non-random order. <\/p>\n\n\n\n

It gets even more interesting. Those same scientists discovered that the grey and white stage items (often shells and pebbles) are precisely ordered from smallest (near the bower) to largest (at the outer edge of the court). This arrangement creates an optical illusion<\/a> that helps the male appear larger when he\u2019s displaying. <\/p>\n\n\n\n

Scientists aren\u2019t exactly sure how all of these amazing adaptations contribute towards reproductive success. But we do know that the longer the female stays and watches, the more likely she will consent to mate.<\/p>\n\n\n\n

\n
\"a
A tooth-billed bowerbird in the canopy. \u00a9 Brian McCauley \/ Flickr<\/a><\/figcaption><\/figure>\n\n\n\n
\"a
Tooth-billed bowerbirds construct display \u201cstages\u201d to woo females. \u00a9 Jim Bendon \/ Flickr<\/a><\/figcaption><\/figure>\n<\/figure>\n\n\n\n

Tooth-billed Bowerbird, aka The Stagemaker<\/h2>\n\n\n\n

Tooth-billed bowerbirds are weird, even by bowerbird standards.<\/p>\n\n\n\n

They\u2019re found in the small patches of remnant rainforest in far north-eastern Queensland, at altitudes between 500 and 1,500 meters. Males and females are a drab, mottled brown, and even the most eagle-eyed birders are unlikely to see the tiny notches on their bill tip, which gives them their name. These \u2018teeth\u2019 are an adaptation for cutting leaves\u2026 which brings us to the next odd thing about this species. <\/p>\n\n\n\n

Tooth-billed bowerbirds don\u2019t actually build bowers. Instead, they groom the forest floor into a bare display court accented by large, upturned green leaves. Males entice females by singing loudly at the edge of the court. They\u2019re also known to mimic the songs of other species. <\/p>\n\n\n\n

\"close
A golden bowerbird in far north Queensland. \u00a9 Adam McKeown, CSIRO \/ Flickr<\/a><\/figcaption><\/figure>\n\n\n\n

Golden Bowerbird: The Heritage Architect<\/h2>\n\n\n\n

These sun-colored birds are the smallest \u2014 and rarest \u2014 bowerbird species in Australia. Female golden bowerbirds are predictably drab, but the males are deep golden yellow, with bright undersides. <\/p>\n\n\n\n

Golden bowerbirds are the only Australian species that don\u2019t build avenue-shaped bowers. Instead, they construct a low platform of sticks that sits between two tall stick towers, each braced by a tree. The structure is decorated with grey-green moss, and white berries and flowers. <\/p>\n\n\n\n

These bowers are built by multiple generations of males; when one male dies or is pushed out, another takes his place and inherits the bower. The oldest bowers on record date back up to 40 years and can reach heights of more than 2 meters (or 6.5 feet), making them the tallest of all bowerbird structures. <\/p>\n\n\n\n

\n
\"\"
\u00a9 Justine E. Hausheer<\/figcaption><\/figure>\n\n\n\n
\"\"
A golden bowerbird male at his bower. \u00a9 Mark Gillow \/ Flickr<\/a><\/figcaption><\/figure>\n<\/figure>\n\n\n\n

These are just four of the world\u2019s bowerbird species that I\u2019ve been lucky enough to see up close. But the fun doesn\u2019t stop there. <\/p>\n\n\n\n

The flame bowerbird sashays like a bug-eyed matador and pulses his pupils<\/span><\/a> to seduce a mate. The MacGregor\u2019s bowerbird builds an elaborate stick tower surrounded by a dance floor, and can mimic everything from barking dogs to playing children<\/span><\/a>. And the Vogelkop bowerbird builds a stick yurt and decorates with heaping piles of blue, red, and orange objects, each sorted by color<\/span><\/a>. <\/p>\n\n\n\n

The more you learn, the more bowerbirds surprise, amaze, and delight.<\/p>\n","protected":false},"excerpt":{"rendered":"

They display, they dance, and they collect baubles like a jealous hoarder. Meet Australia\u2019s incredible bowerbirds. <\/p>\n","protected":false},"author":304,"featured_media":73389,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"byline":{"profiles":[{"type":"byline_id","atts":{"term_id":19072,"post_id":48086}}]},"cgs_exclude_from_tnc_science":true,"cgs_references":"

Endler, J.A., et al. (2010). Great Bowerbirds Create Theaters with Forced Perspective When Seen by Their Audience<\/a>. Current Biology<\/em>, 20(18). 1679-1684.<\/p>\n

Endler, J.A., et al. (2014). Visual effects in great bowerbird sexual displays and their implications for signal design<\/a>. Proc. Royal Soc. B<\/em>, 281(1783). https:\/\/doi.org\/10.1098\/rsos.160661\/<\/a>.<\/p>\n

Kelley, L.A., & Endler, J.A. (2012). Illusions Promote Mating Success in Great Bowerbirds.<\/a> Science<\/em>, 335(6066). 335-338.<\/p>\n

Patricelli, G. L., et all. (2006). Male satin bowerbirds, Ptilonorhynchus violaceus, adjust their display intensity in response to female startling: an experiment with robotic females<\/a>. Animal Behaviour<\/em>, 71(1). 49-59.<\/p>\n

Wojcieszek, J.M., et al. (2006). Theft of bower decorations among male Satin Bowerbirds (Ptilonorhynchus violaceus): why are some decorations more popular than others?<\/a> Emu<\/em>,106. 175\u2013180<\/p>\n

Wojcieszek, J.M., et al. (2007). Stealing behavior and the maintenance of a visual display in the satin bowerbird<\/a>. Behavioral Ecology<\/em>, 18(4). 689\u2013695. https:\/\/doi.org\/10.1093\/beheco\/arm031<\/a><\/p>\n","cgs_subhed":"They display, they dance, and they collect baubles like a jealous hoarder. Meet Australia's incredible bowerbirds. 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