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Glossary
Invertebrates: animals with no backbone.
Monogamous: having only one mate during a breeding season, or throughout the breeding life of a pair.
Territory: an area occupied and defended by an animal, a pair of animals or a colony.
Haug, E.A., Millsap, B.A. and Martell, M.S. (1993) Burrowing Owl (Athene cunicularia). In: Poole, A. (Ed) The Birds of North America Online.Cornell Lab of Ornithology, Ithaca.
Gould, J. and Darwin, C.R. (1839) Birds Part 3 No. 2 of The zoology of the voyage of H.M.S. Beagle.Smith Elder and Co, London. Available at: http://darwin-online.org.uk
Levey, D.J., Duncan, R.S. and Levins, C.F. (2004) Use of dung as a tool by burrowing owls. Nature, 43: 39 - .