The Last Word On Nothing

Mind the Gap

A recent doctoral study by graduate student Stephanie Chia applied persistent homology, a topological data‑analysis technique, to map the morphological trait space of passerine songbirds. By reconstructing ancestral shapes and charting existing species, the research identified several plausible bird forms that never appeared. The analysis suggests that competition from closely related bird families occupied those vacant niches, preventing the evolution of the missing forms. The findings highlight how mathematical tools can reveal hidden gaps in evolutionary history.