The change in diet composition resulted in clear differences in the particle size distribution in HNSP and LNSP feces. HNSP feces consisted of bigger particles and less dissolved material when compared with LNSP feces. After disintegration of the fecal pellet, only 10% of LNSP feces could have been retained on a microscreen of 36 m, when compared to almost 50% retention for HNSP feces.Comparing size distribution of disintegrated feces to literature values was not possible since we were not aware of other studies investigating particle size distribution in feces with a similar objective and methodology.