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The fragmentation of landscapes produces habitat gaps where the distance between visual landmarks may exceed the perceptual range of a species and impose navigational constraints. We estimated the visual perceptual range of the Australian sleepy lizard, Tiliqua rugosa, by releasing individuals in the centre of a cleared arena in high temperature conditions, with a 0.5-m-high bush placed either 10,...
The Australian sleepy lizard, Tiliqua rugosa, maintains monogamous associations for an average of 6 weeks before mating each spring. One hypothesis to explain this prolonged partnership is that males are guarding their female partners from rival males. This hypothesis has three predictions, that males are more aggressive than females to conspecific males, that male aggression will increase as the...
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