No reason why that would cause problems, although you can expect lower precision when animals form groups than when they are spread through the study area – and consquently, you may need to have greater survey effort when animals are in groups. It is also more impotant to have an adequate number of lines or points in the design.
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The number of independent detections is number of groups detected when animals are in groups, and number of animals detected when they are not in groups. So the sample size (in terms of number of independent detections) is much smaller when the animals form groups. Small sample size equates to low precision. In terms of number of animals, encounter rate (number of animals per unit distance travelled for line transects, or per point for point transects) is a lot more variable when animals are in groups.
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