  The modes of a statistical population are high frequency points around which
most of the probability mass is accumulated. For the particular case of
circular densities, we address the problem of testing if, given an observed
sample of a random angle, the underlying circular distribution model is
multimodal. Our work is motivated by the analysis of migration patterns of
birds and the methodological proposal follows a novel approach based on
likelihood ratio ideas, combined with critical bandwidths. Theoretical results
support the behaviour of the test, whereas simulation examples show its finite
sample performance.
