<p>The chemical composition of drone pentane extracts was analysed using gas-chromatography. The figure shows the representations of all individuals in the three age groups according to the first three factors of Principal Component Analyses (PCA) performed on (<b>A</b>) the 183 peaks of the whole chemical profiles, (<b>B</b>) only the 84 peaks of the high-volatility fraction, or (<b>C</b>) only the 99 peaks of the low-volatility fraction. The three PCAs show clear differences between the chemical profiles of the three age groups.</p
