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and spring. We estimate the energy expenditure for the entire population to range from 23.6 kJ ha-' day-' during winter to 117.3 kJ ha-' day-' during summer. The time spent in activity by this species is strongly seasonal and is positively correlated to the daily solar radiation. However, even during summer, the season of greatest activity, the time spent in activity is not great (mean = 47.6 min/day; range = 12.3-141.3 min/day) compared to the tropical iguanas Conolophus pallidus (mean = 100 min/day) and Cyclura nubila (mean = 92 min/ day) and the tropical varanid V. panoptes (mean = 228 min/day during the dry season, its season of greatest activity). Thus, it is inappropriate to generalize all varanid lizards as being extremely active.
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Christian et al. (1994) studied this question.
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