General view of a Saks Fifth Avenue Holiday shopping window display on November 30, 2015 in New York City. (Photo by Michael Loccisano/Getty Images)

A model displays a creation by Portuguese designer David Ferreira on the second day of the Lisbon Fashion Week, at the Carlos Lopes Pavillion in Lisbon, Portugal, 09 March 2019. (Photo by Miguel A. Lopes/EPA/EFE)

A transparent van is displayed by a vendor for safety devices at the IAA Auto Show in Frankfurt, Germany, Tuesday, September 10, 2019. (Photo by Michael Probst/AP Photo)

A model displays a collection called “Chubby Chaser” by Netherlands-based Maison The Faux during New York Fashion Week in New York on September 9, 2016. (Photo by Angela Weiss/AFP Photo)

Birds made of recycled tires are displayed in a shop located on the Panamerican highway near Catarina town, May 7, 2015. Salazar recycles used tyres to make bird figurines and sofas to sell in his shop located on the Panamerican highway. (Photo by Oswaldo Rivas/Reuters)

The Screamin' Sasquatch jet powered Waco Biplane sits on display during media day for the Canadian International Air Show at Billy Bishop Airport, Toronto, Ontario, September 4, 2015. (Photo by Louis Nastro/Reuters)

The Greater Sage-Grouse is certainly a formidable-looking bird. Being the largest grouse in North America and having tail feathers, which look like giant spikes, make for a ferocious sight. These birds are well known for their complicated courtship rituals, in which the males perform a special “strutting display” to attract the females. Another distinct feature of the Greater Sage-Grouse is two large yellow throat sacs (gular sacs), which are inflated by the males during the courtship display. Unlike pelicans, whose gular sacs are used to store fish while hunting, the throat sacks of the Greater Sage-Grouse are merely for display.

Models present creations displayed as part of the “Lingerie Rocks” fashion show, running on the sidelines of Paris Fashion Week, in Paris, France, 20 January 2019. The “Lingerie Rocks” show displays work from 14 lingerie brands, including Antigel, Antinea, Aubade, Chantelle, Empreinte, Eprise, Epure, Implicite, Lise Charmel, Lou, Louisa Bracq, Maison Lejaby, Passionata et Simone Perele. (Photo by Ian Langsdon/EPA/EFE)