BACKGROUND: Parrots are one of the most frequently kept and bred bird orders in captivity. This increases poaching and thus the potential importance of captive populations for rescue programmes managed by zoos and related institutions. Both captive breeding and poaching are selective and may be influenced by the attractiveness of particular species to humans. In this paper, we tested the hypothesis that the size of zoo populations is not only determined by conservation needs, but also by the perceived beauty of individual parrot species assessed by human observers. METHODOLOGY/PRINCIPAL FINDINGS: For the purpose of data collection, we defined four sets of species (40 parrots, 367 parrots, 34 amazons, 17 macaws). Then, we asked 776 human respondents to evaluate parrot pictures of the selected species according to perceived beauty and we analyzed its association with color and morphological characters. Irrespective of the species set, we found a good agreement among the respondents. The preferred species tended to be large, colorful, and long-tailed. CONCLUSIONS/SIGNIFICANCE: We repeatedly confirmed significant, positive association between the perceived beauty and the size of worldwide zoo population. Moreover, the range size and body size appeared to be significant predictors of zoo population size. In contrast, the effects of other explanatory variables, including the IUCN (International Union for Conservation of Nature) listing, appeared insignificant. Our results may suggest that zoos preferentially keep beautiful parrots and pay less attention to conservation needs.

Department of Zoology Faculty of Sciences Charles University Prague Prague Czech Republic

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del Hoyo J, Elliott A, Sargatal J. Sandgrouse to cuckoos. Barcelona: Lynx edicions; 1997. Handbook of the birds of the world. Vol. 4.

Pepperberg IM. Evidence for numerical competence in an African grey parrot (Psittacus erithacus). J Comp Psychol. 1994;108:36–44.

Funk M. Problem solving skills in young yellow-crowned parakeets (Cyanoramphus auriceps). Anim Cogn. 2002;5:167–176. PubMed

Pepperberg IM. Cambridge: Harvard University Press; 1999. The Alex studies: cognitive and communicative abilities of grey parrots. PubMed

Huber L, Gajdon GK. Technical intelligence in animals: the kea model. Anim Cogn. 2006;9:295–305. PubMed

Emery NJ, Seed AM, von Bayern AM, Clayton NS. Cognitive adaptations of social bonding in birds. Philos Trans R Soc Lond B Biol Sci. 2007;362:489–505. PubMed PMC

Pepperberg I. Grey parrot numerical competence: a review. Anim Cogn. 2006;9:377–391. PubMed

Borsari A, Ottoni E. Preliminary observations of tool use in captive hyacinth macaws (Anodorhynchus hyacinthinus). Anim Cogn. 2005;8:48–52. PubMed

Zentall TR. Action imitation in birds. Learn Behav. 2004;32:15–23. PubMed

Mui R, Haselgrove M, Pearce J, Heyes C. Automatic imitation in budgerigars. Proc R Soc Lond B Biol Sci. 2008;275:2547–2553. PubMed PMC

Anderson P. A bird in the house: an anthropological perspective on companion parrots. Soc Anim. 2003;11:393–418.

IUCN Red List of Threatened Species (accessed 2009). World Conservation Union, http://www.iucnredlist.org.

Collar NJ, Juniper AT. New world parrots in crisis: solutions from conservation biology. In: Beissinger SR, Snyder NFR, editors. Washington: Smithsonian Institution Press; 1992. pp. 1–24.

Beissinger SR, Bucher EH. Can parrots be conserved through sustainable harvesting? BioScience. 1992;42:164–173.

Wright TF, Toft CA, Enkerlin-Hoeflich E, Gonzalez-Elizondo J, Albornoz M, et al. Nest poaching in neotropical parrots. Conserv Biol. 2001;15:710–720.

González JA. Harvesting, local trade, and conservation of parrots in the Northeastern Peruvian Amazon. Biol Conserv. 2003;114:437–446.

Pain DJ, Martins TLF, Boussekey M, Diaz SH, Downs CT, et al. Impact of protection on nest take and nesting success of parrots in Africa, Asia and Australasia. Anim Conserv. 2006;9:322–330.

Herrera M, Hennessey B. Quantifying the illegal parrot trade in Santa Cruz de la Sierra, Bolivia, with emphasis on threatened species. Bird Conserv Int. 2007;17:295–300.

Sanz V, Grajal A. Successful reintroduction of captive-raised yellow-shouldered Amazon parrots on Margarita Island, Venezuela. Conserv Biol. 1998;12:430–441.

Collazo JA, White TH, Vilella FJ, Guerrero SA. Survival of captive-reared hispaniolan parrots released in Parque Nacional del Este, Dominican Republic. Condor. 2003;105:198–207.

Brightsmith D, Hilburn J, del Campo A, Boyd J, Frisius M, et al. The use of hand-raised psittacines for reintroduction: a case study of scarlet macaws (Ara macao) in Peru and Costa Rica. Biol Conserv. 2005;121:465–472.

Snyder NFR, Koenig SE, Koschmann J, Snyder HA, Johnson TB. Thick-billed parrot releases in Arizona. Condor. 1994;96:845–862.

Munn CA. Parrot conservation, trade, and reintroduction. In: Luescher A, editor. Manual of parrot behavior. Ames: Blackwell Publishing; 2006. pp. 27–32.

Jeggo DF, French H, Bellingham L, Copsey J, Fidgett AL, et al. Breeding programme for St Lucia amazon. Int Zoo Yearb. 2000;37:214–220.

Brock MK, White BN. Application of DNA fingerprinting to the recovery program of the endangered Puerto Rican parrot. P Natl Acad Sci U S A. 1992;89:11121–11125. PubMed PMC

Meyers JM. Evaluation of 3 radio transmitter and collar designs for Amazona. Wildl Soc Bull. 1996;24:15–20.

White TH, Jr, Collazo JA, Viella JF. Survival of captive-reared Puerto Rican parrots released in the Caribbean national forest. Condor. 2005;107:424–432.

Sheppard C. Propagation of endangered birds in US institutions: how much space is there? Zoo Biol. 1995;14:197–210.

Balmford A, Mace GM, Leader-Williams N. Designing the ark: setting priorities for captive breeding. Conserv Biol. 1996;10:719–727.

Ward PI, Mosberger N, Kistler C, Fischer O. The relationship between popularity and body size in zoo animals. Conserv Biol. 1998;12:1408–1411.

Balmford A. Separating fact from artifact in analyses of zoo visitor preferences. Conserv Biol. 2000;14:1193–1195.

Ward PI. Zoo visitor preferences: reply to balmford. Conserv Biol. 2000;14:1196.

Haahr M (accessed 2007) True Random Numbers Generator - Integers/Sequences. http://www.random.org/

BirdLife International (accessed 2008) The BirdLife checklist of the birds of the world, with conservation status and taxonomic sources. Version 1. http://www.birdlife.org/datazone/species/downloads/BirdLife_Checklist_Version_1.zip.

Forshaw JM, Knight F. New Jersey: Princeton University Press; 2006. Parrots of the world: an identification guide.

Juniper T, Parr M. London: Publishers Ltd; 2003. Parrots: a guide to the parrots of the world.

Marešová J, Frynta D. Noah's Ark is full of common species attractive to humans: the case of boid snakes in Zoos. Ecol Econ. 2008;64:554–558.

Marešová J, Landová E, Frynta D. What makes some species of milk snakes more attractive to humans than others? Theory Biosci. 2009;128:227–235. PubMed

Schmitz C et al. (accessed November 2007) LimeSurvey - The open source survey application. Version 1.53plus. http://www.limesurvey.org.

International Species Information System (ISIS) database (accessed 2008) http://www.isis.org.

Flesness NR, Lukens DR, Jr, Porter SB, Wilson CR, Grahn LV. ISIS and studbooks, very high census correlation for the North American zoo population: a reply to Earnhardt, Thompson, and Willis. Zoo Biol. 1995;14:509–517.

Arndt T. Bretten: Arndt-Verlag; 2004. Lexicon of Parrots 2.0 (CD-ROM Version).

Robiller F. Über die Papageien der Welt in drei Bänden. Papageien: Bd. 1-3. Berlin: DLV; 1992. Handbuch der Vogelpflege.

Wright TF, Schirtzinger EE, Matsumoto T, Eberhard JR, Graves GR, et al. A multilocus molecular phylogeny of the parrots (Psittaciformes): support for a Gondwanan Origin during the Cretaceous. Mol Biol Evol. 2008;25:2141–2156. PubMed PMC

StatSoft (accessed 2001) Statistica, Version 6.0. http://www.statsoft.com.

SPSS Inc (accessed 2007) Spss, version 16.0. http://www.winwrap.com.

Marešová J, Krása A, Frynta D. We all appreciate the same animals: cross-cultural comparison of human aesthetic preferences for snake species in Papua New Guinea and Europe. Ethology. 2009;115:297–300.

Frynta D, Marešová J, Landová E, Lišková S, Šimková O, et al. Are animals in zoos rather conspicuous than endangered? In: Columbus AM, Kuznetsov L, editors. Endangered species: new research. 299-341. New York: Nova Science Publishers; 2009.

Soulé M, Gilpin M, Conway W, Foose T. The millenium ark: how long a voyage, how many staterooms, how many passengers? Zoo Biol. 1986;5:101–113.

WAZA. Bern: WAZA Executive Office; 2005. Building a future for wildlife - the world zoo and aquarium conservation strategy.

Wilkinson R. An overview of captive-management programmes and regional collection planning for parrots. Int Zoo Yearb. 2000;37:36–58.

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Association Between Fear and Beauty Evaluation of Snakes: Cross-Cultural Findings

What flowers do we like? The influence of shape and color on the rating of flower beauty

Human preferences for colorful birds: Vivid colors or pattern?

Mammalian collection on Noah's Ark: the effects of beauty, brain and body size