Suffolk Birci Report 2002 References Eastwood, E. 1967. Radar Ornithology. London. Lack, D. 1956. Swifts in a Tower. London. Petrins, C.M., 2001. Roosting Behaviour of Common Swifts. Brit. Birds. 94: 204-205 Schaefer, G.W. 1966. The study of bird echoes using a tracking radar. Proc. I4th Int. Orn. Congress. Wright, M., Brenchley, A., Evans, S., Howe, T., & Underwood, D. 2000. Roosting Behaviour of Common Swifts. Brit. Birds. 93: 145.
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