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# References

Baker, J. M. R. (1992) Body condition and tail height in great crested newts, Triturus cristatus, Animal Behaviour, 43, pp. 157-159.

Bronson, F. H. (1987) Environmental regulation of reproduction in rodents. In: Psychobiology of Reproductive Behavior, D. Crews (ed.), Prentice Hall, New Jersey. p. 209.

Hedenstrom, A. and Alerstam, T. (1992) Climbing performance of migratory birds as a basis for estimating limits for fuel-carrying capacity and muscle work, Journal of Experimental Biology, 164, pp. 19-38.

Irving, L. (1966) Adaptations to cold, Scientific American, 214, pp. 94-101.

Kenagy, G. J. (1981) Effects of day length, temperature, and endogenous control on annual rhythms of reproduction and hibernation in chipmunks (Eutamias spp.), Journal of Comparative Physiology A, 141, pp. 369-378.

Macdonald, D. W. (1976) Food caching by red foxes and some other carnivores, Zeitschrift fur Tierpsychologie, 42, pp. 170-185.

Nunes, S., Ha, C.-D. T., Garrett, P. J., Mueke, E. M., Smale, L. and Holekamp. K.E. (1998) Body fat and time of year interact to mediate dispersal behaviour in ground squirrels, Animal Behaviour, 55, pp. 605-614.

Pinder, A. W., Storey, K. B. and Ultsch, G. R. (1992) Estivation and hibernation, in: Environmental Physiology of Amphibians, Feder, M. E. and Burggren, W. W. (eds), Chicago University Press, pp. 250-276.

Pough, F. H., Heiser, J. B. and McFarland, W. N. (1996) Vertebrate Life (4th. edn), Prentice Hall, New Jersey, pp. 589, 688, 695.

Valerio, P. F., Kao, M. H. and Fletcher, G. L. (1992) Fish skin: an effective barrier to ice crystal propagation, Journal of Experimental Biology, 164, pp. 135-151.

Further reading

Barnes, R. S. K., Calow, P. and Olive, P. J. W. (1988) The Invertebrates: a New Synthesis, Blackwell Scientific Publications, Oxford. [A comprehensive review of diversity, evolution and ecology of invertebrates.]

Irving, L. (1966) Adaptations to cold, Scientific American, 214, pp. 94-101. [An important and accessible summary of physiological adaptations of vertebrates to cold.]

Krebs, J. R. and Davies, N. B. (1987) An Introduction to Behavioural Ecology (2nd edn), Blackwell Scientific Publications, Oxford. [A collection of essays by leading researchers on key themes in behavioural ecology.]

Pond, C. M. (2000) The Fats of Life, (2nd edn) Cambridge University Press. [This book explains in simple language the biology of feasting and fasting, fattening and slimming in wild animals as well as people.]

Pough, F. H., Janis, C. M. and Heiser J. B. (1999) Vertebrate Life (5th. edn), Prentice Hall, New Jersey. (6th edn expected 2001) [A wide-ranging review of the diversity, function and evolution of vertebrates.]

Raven, P. H., Evert, R. F. and Eichhorn, S. E. (1999) Biology of Plants (6th edn.), Freeman, New York. [A richly-illustrated book that deals with all aspects of plant biology, from cellular mechanisms to ecology, and covering physiology, evolution and diversity.]

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