<p>Understanding animals’ sensory limitations can help explain their foraging decisions or task performance. Here, we studied leafcutter ants (<i>Atta colombica</i>), and how carrying an oversized load might impede their ability to tap the ground with their antenna, therefore limiting chemo- and mechano-receptor perception. When workers carry an oversized load, they walk more slowly, delaying the nestmates walking behind. Hence, we tested the hypothesis that an oversized load limits the workers’ ability to tap the ground with the antennae, presumably reducing the ability to smell the foraging trail through contact chemoreceptors or to sense terrain irregularities and obstacles through mechanoreceptors. Laden workers tapped their antennae fewer times per step than unladen workers; this decrease was greater as load size increased, but only for larger ants. Load shape did not affect antennae tapping. Also, workers increased antennae taps after experimentally reducing a standardized load. Last, we evaluated the allometric relation between the antennae length and worker size, and it showed negative allometry. Hence, larger ants had proportionally shorter antennae, which could explain why antennae tapping is more affected by load size in larger workers. Overall, our results evidence that carrying an oversized load limits the ability of workers to tap the ground, akin to blind spots while driving a large truck. The limitation of large loads on antennae tapping indicates they obtain information from mechano- and chemo-receptors less frequently than when carrying smaller loads. Documenting similar mechanical limitations in the sensory system faced by other social and solitary organisms while foraging, can help us further our understanding of foraging behavior.</p>