Why do blue-footed boobies have blue feet? And 8 other blue-footed booby facts

The blue-footed booby (Sula nebouxii) is a seabird found on islands off the Pacific coast of South America, including the Galápagos Islands, Peru, and Mexico's Gulf of California. Its distinctive blue feet are derived from nutrients in fresh fish and serve as an indicator of the bird's health and nourishment, influencing mate selection. The species is a skilled diver, capable of reaching depths of 80 feet, but faces risks to its food sources due to climate change and ocean acidification.

• The blue pigmentation of the blue-footed booby's feet is derived from nutrients in fresh fish and serves as a biological indicator of the bird's health; more intense pigmentation correlates with higher levels of nourishment.
• Blue-footed boobies use their feet for thermoregulation through a process called urohidrosis, which involves urinating and defecating on their feet to stay cool.
• The species is highly adapted for diving, utilizing air sacs to protect the brain from pressure, allowing them to dive from heights of 100 feet and reach depths of 80 feet below the water surface to hunt fish, squid, and offal.
• Climate change and ocean acidification are identified as accelerating threats that put blue-footed boobies and other seabirds at risk, specifically regarding the stability of their food sources.
• Mating selection is influenced by the brightness of the feet, which birds associate with fertility, youth, and competence in raising offspring; males attract females by exaggerating their walk to showcase their feet.

APA

WWF International (n.d.). Why do blue-footed boobies have blue feet? And 8 other blue-footed booby facts. https://www.worldwildlife.org/resources/facts/why-do-blue-footed-boobies-have-blue-feet-and-8-other-blue-footed-booby-facts/

Chicago

WWF International. Why do blue-footed boobies have blue feet? And 8 other blue-footed booby facts. n.d. https://www.worldwildlife.org/resources/facts/why-do-blue-footed-boobies-have-blue-feet-and-8-other-blue-footed-booby-facts/.

Wikipedia

{{cite report |author=WWF International |title=Why do blue-footed boobies have blue feet? And 8 other blue-footed booby facts |url=https://www.worldwildlife.org/resources/facts/why-do-blue-footed-boobies-have-blue-feet-and-8-other-blue-footed-booby-facts/ |access-date=23 October 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{wwfinternationalndwhy, author = {{WWF International}}, title = {{Why do blue-footed boobies have blue feet? And 8 other blue-footed booby facts}}, institution = {WWF International}, url = {https://www.worldwildlife.org/resources/facts/why-do-blue-footed-boobies-have-blue-feet-and-8-other-blue-footed-booby-facts/}, urldate = {2026-10-23}, note = {Indexed by Climate Insights Directory} }