Aengus WL, Millam JR Taming parent-reared orange-winged Amazon parrots by neonatal handling. Zoo Biol. 1999; 18
Amuno JB, Massa R, Dranzoa C Abundance, movement and habitat use by African Grey Parrots (Psittacus erithacus) in Budongo and Mabira forest reserves, Uganda. Ostrich, Journal of African Ornithology. 2007; 78:(2)225-31
Athan M, Deter D The African Grey Parrot Handbook.Hauppauge, NY: Barron's Educational Series; 2000
Aydinonat D, Penn DJ, Smith S Social isolation shortens telomeres in African Grey parrots (Psittacus erithacus erithacus). PLoS One. 2014; 9:(4)
Baun MM, Bergstrom N, Langston NF, Thoma L Physiological Effects of Human/Companion Animal Bonding. Nurs Res. 1984; 33:(3)126-9
Beck AM, Katcher AH Between Pets and People: The Importance of Animal Companionship, Revised edn. West Lafayette: Purdue University Press; 1996
de Grahl W The Grey Parrot.Neptune, NJ: TFH Publications; 1987
Davis C. Appreciating avian intelligence: the importance of a proper domestic environment. J Am Vet Med Assoc. 1998; 212:(8)1220-2
Fox RA, Millam JR The effect of early environment on neophobia in orange-winged Amazon parrots (Amazona amazonica). Appl Anim Behav Sci. 2004; 89:117-29
Friedman SG, Martin S, Brinker B Behavior analysis and parrot learning. In: Luescher AU Oxford: Blackwell Publishing; 2006
Gaskins LA, Hungerford L Nonmedical factors associated with feather picking in pet psittacine birds. J Avian Med Surg. 2014; 28:(2)109-17
Graham DL Pet birds: historical and modern perspectives on the keeper and the kept. J Am Vet Med Assoc. 1998; 212:(8)1216-19
Greenwell PJ, Montrose VT The grey matter: Prevention and reduction of abnormal behavior in companion grey parrots (Psittacus erithacus). Journal of Veterinary Behaviour. 2017; 44-51
Juniper T, Parr M Parrots: A Guide to Parrots of the World.New Haven, CT: Yale University Press; 1998
McGlone F, Vallbo AB, Olausson H, Loken L, Wessberg J Can J Exp Psychol. 2007; 61:(3)173-83
May DL Field studies of African Grey parrots in the Central African Republic.Orlando, Florida1996
Meehan CL, Millam JR, Mench JA Foraging opportunity and increased physical complexity both prevent and reduce psychogenic feather picking by young Amazon parrots. Appl Anim Behav Sci. 2003; 80:71-85
Pepperberg IM (Numerical competence in an African gray parrot (Psittacus erithacus). J Comp Psychol. 1994; 108
Pepperberg IM Cognitive and communicative abilities of grey parrots. Curr Dir Psychol Sci. 2002a; 11
Pepperberg IM In search of King Solomon's ring: cognitive and communicative studies of Grey parrots (Psittacus erithacus). Brain Behav Evol. 2002b; 59
Pepperberg IM ‘Insightful’ string-pulling in Grey parrots (Psittacus erithacus) is affected by vocal competence. Anim Cogn. 2004; 7
Pepperberg IM Ordinality and inferential abilities of a grey parrot (Psittacus erithacus). J Comp Psychol. 2006; 120
Pepperberg IM Grey Parrot (Psittacus erithacus) numerical abilities: addition and further experiments on a zero-like concept. J Comp Psychol. 2006; 120
Pepperberg IM Individual differences in grey parrots (Psittacus erithacus): effects of training. J Ornithol. 2007; 148
Pepperberg IM Further evidence for addition and numerical competence by a Grey parrot (Psittacus erithacus). Anim Cogn. 2012; 15
Punyanunt-Carter NM, Wrench JS Development and validity testing of a measure of touch deprivation. Human Communication. A Publication of the Pacific and Asian Communication Association. 2007; 12:(1)67-76
Rosskopf WJ, Woerpel RW Pet avian conditions and syndromes of the most frequently presented species seen in practice. Vet Clin North Am Small Anim Pract. 1991; 21
Schmid R, Doherr MG, Steiger A The influence of the breeding method on the behaviour of adult African grey parrots (Psittacus erithacus). Appl Anim Behav Sci. 2006; 98
Seibert LM Feather picking disorder in pet birds. In: Luescher AU Oxford: Blackwell Publishing; 2006a
Seibert L Social behavior of Psittacine birds. In: Luescher AU Oxford: Blackwell Publishing; 2006a
Silva T Psittaculture.Ontario, Canada: Silvio Mattacchione and Co; 1991
Speer B Current Therapy in Avian Medicine and Surgery. 2016;
Saunders Snyder NFR, Wiley JW, Kepler CB The Parrots of Luquillo: Natural History and Conservation of the Peurto Rican Parrot.Los Angeles, California, USA: The Western Foundation of Vertebrate Zoology; 1987
Tamungang SA, Cheke RA, Kougoum GP Linking population size to conservation needs of the Grey Parrot in Cameroon. International Journal of Biodiversity and Conservation. 2013; 5:(8)478-85
Van Sant F Problem sexual behaviors of companion parrots. In: Luescher AU Oxford: Blackwell Publishing; 2006
Van Zeeland YRA, Spruit BM, Rodenburg TB Feather damaging behaviour in parots: A review with consideration of comparative aspects. Appl Anim Behav Sci. 2009; 121:75-95
Wilson L, Luescher AU Parrots and fear. In: Luescher AU Ames, IA: Blackwell Publishing; 2006