a b c Drummond, Hugh; Gonzalez, Edda; Osorno, Jose Luis (1986). "Parent-offspring cooperation in the Blue-footed Booby ( Sula nebouxii): social roles in infanticidal brood reduction". Behavioral Ecology and Sociobiology. 19 (5): 365–372. doi: 10.1007/bf00295710. S2CID 36417383. Males also assess their partner's reproductive value and adjust their own investment in the brood according to their partner's condition. Females that lay larger and brighter eggs are in better condition and have greater reproductive value. Therefore, males tend to display higher attentiveness and parental care to larger eggs, since those eggs were produced by a female with apparent good genetic quality. Smaller, duller eggs garnered less paternal care. Female foot color is also observed as an indication of perceived female condition. In one experiment, the color of eggs was muted by researchers, males were willing to exercise similar care for both large eggs and small eggs if his mate had brightly colored feet, whereas males paired with dull-footed females only incubated larger eggs. Researchers also found that males did not increase their care when females exhibited both bright feet and high-quality offspring. [21] Behavior and ecology [ edit ] Hunting and feeding [ edit ] Feeding of a juvenile Sequence showing plunge-diving from beginning to end Blue-footed boobies fishing in a large group a b Drummond, Hugh; Gonzalez, Edda; Osorno, Jose Luis (1986). "Parent-Offspring Cooperation in the Blue-footed Booby ( Sula nebouxii): Social Roles in Infanticidal Brood Reduction". Behavioral Ecology and Sociobiology. 19 (5): 365–372. doi: 10.1007/bf00295710. S2CID 36417383. Loughweed, Lynn W. (1999). "Parent Blue-footed Boobies suppress siblicidal behavior of offspring". Behavioral Ecology and Sociobiology. 45 (1): 11–18. doi: 10.1007/s002650050535. S2CID 21985621. Angier, Natalie (March 6, 2017). "On Galapagos, Revealing the Blue-Footed Booby's True Colors". The New York Times. Archived from the original on June 22, 2022 . Retrieved September 26, 2022.

Its closest relative is the Peruvian booby. The two species likely split from each other recently due to their shared ecological and biological characteristics. [10] A 2011 study of multiple genes calculated the two species diverged between 1.1 and 0.8 million years ago. [11] Moms on TikTok are getting in on the latest social-media challenge by exposing their breasts to their babies and recording their enticed reactions. Blue-footed Booby - Sula nebouxii". NatureWorks. Archived from the original on 19 March 2013 . Retrieved 26 November 2012.a b Drummond, Hugh; Chavelas, Cecilia Garcia (1989). "Food shortage influences sibling aggression in the Blue-footed Booby". Animal Behaviour. 37: 806–819. doi: 10.1016/0003-3472(89)90065-1. S2CID 53165189. Unlike other avenues that offer immediate satisfaction, the creators of this little diversion have programmed it with strict instructions that you cannot skip ahead days. So if you want to see all 50 breasts (25 days X 2 breasts per day), you just have to wait. Drop ’em out, let me see them ti - - ies,” the 2015 country song goes. “Gonna take a long look at those tig ol’ bitties.” Anderson, David J. (1989). "Differential responses of boobies and other seabirds in the Galápagos to the 1986–87 El Nino- Southern Oscillation event". Marine Ecology Progress Series. 52: 209–216. doi: 10.3354/meps052209.

Morales, Judith; Torres, Roxana; Velando, Alberto (2012). "Safe betting: males help dull females only when they raise high-quality offspring". Behavioral Ecology and Sociobiology. 66 (1): 135–143. doi: 10.1007/s00265-011-1261-8. S2CID 14882787. Milne-Edwards, Alphonse (1882). "Recherches sur la faune des régions Australes: Chapitre VII - Totipalmes". Annales des sciences naturelles, Zoologie. 6 (in French). 13 (4). p. 37, plate 14. Blue-footed Booby, Sula nebouxii". MarineBio. Archived from the original on December 20, 2012 . Retrieved December 21, 2012. a b Díaz, Hernández; José Alfredo; Erika Nathalia Salazar Gómez. "Blue-footed Booby ( Sula nebouxii)". Neotropical Birds Online . Retrieved 9 December 2012. Zavalaga, Carlos B.; Benvenuti, Silvano; Dall'Antonia, Luigi; Emslie, Steven D. (2007). "Diving behavior of Blue-footed Boobies Sula nebouxii in northern Peru in relation to sex, body size and prey type". Marine Ecology Progress Series. 336: 291–303. doi: 10.3354/meps336291.a b Harris, M. 2001. "Sula nebouxii" (On-line), Animal Diversity Web. Accessed September 22, 2013 at http://animaldiversity.ummz.umich.edu/accounts/Sula_nebouxii/

Osorno, Jose Luis; Drummond, Hugh (1995). "The function of hatching asynchrony in the Blue-footed Booby". Behavioral Ecology and Sociobiology. 37 (4): 265–273. doi: 10.1007/bf00177406. S2CID 23498574. Gill, Frank; Donsker, David, eds. (2016). "Hamerkop, Shoebill, pelicans, boobies & cormorants". World Bird List Version 6.3. International Ornithologists' Union . Retrieved 31 July 2016. a b c d "Blue-footed Booby Day". Galapagos Conservation Trust. 2010. Archived from the original on 31 December 2012 . Retrieved 26 November 2012. That's right, you heard me — the hottest new Christmas trend, according to The Sun, is the "reindeer boob." Described as a "bold take" on the ugly sweater trend, reindeer boob entails cutting a hole in your sweater to allow for the flaunting of a boob of your choice and then putting googly eyes, antlers, and a red nose on said boob so it resembles a reindeer. Hey, why not? a b Drummond, Hugh; Torres, Roxana; Krishnana, V.V. (2003). "Buffered development: resilience after aggressive subordination in infancy". The American Naturalist. 161 (5): 794–807. doi: 10.1086/375170. PMID 12858285. S2CID 24047097.Drummond, Hugh; Rodriguez, Cristina; Schwabl, Hubert (2008). "Do mothers regulate facultative and obligate siblicide by differentially provisioning eggs with hormones?". Journal of Avian Biology. 39 (2): 139–143. doi: 10.1111/j.0908-8857.2008.04365.x.