In the 1970 ’ s, a research group led by Peter and Rosemary Grant began studying these finches and discovered that after a year of drought, finches that had slightly bigger beaks survived more readily than those with smaller beaks.
aastatel hakkas teadlasterühm Peter ja Rosemary Granti juhendamisel neid vintlasi uurima ning avastas, et põua - aasta olid paremini üle elanud teistest veidi suurema nokaga vintlased.