Diet breadth and the degree of capital breeding have been established as major determinants of species-specific ecology of herbivorous insects. The relationship of these variables with sensory capacity, although allowing an array of hypotheses, has remained poorly studied, let alone in phylogenetically explicit multi-species comparisons. We contribute to filling this gap in a study of 60 species of geometrid moths (Lepidoptera: Geometridae), using adult head measures (eye size, antennal length and shape, forehead width) as...