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Cactus26<br>Adapted from: * F&amp;ouml;ger, M. & Pegoraro K. (2004). <i>Die Blaumeise</i>. Neue Brehm Bücherei, Hohenwarsleben, ISBN 3-89432-862-2 * Harrap, S. & Quinn, D. (1996). <i>Tits, Nuthatches & Treecreepers</i>. Helm Identification Guides, ISBN 0-7136-3964-4 * del Hoyo, J., et al. <i>Handbook of the Birds of the World</i> (HBW), Vol. 12 (2007). <i>Picathartes to Tits and Chickadees</i>. Lynx Edicions, Barcelona, ISBN 84-96553-42-6 * Snow, D. W. & Perrins, C. M. (1998). <i>The Birds of the Western Palearctic</i> Concise Edition. Oxford, ISBN 0-19-854099-X