The scientific journal Ornithology Research has published an article co-authored by Agnieszka Parapura, a doctoral student at the Doctoral School of the Siedlce University of Natural Sciences and Humanities.
The article concerns the singing rate of male common rosefinch Erythrina erythina. Yearlings (uncolored) males sing 2, 3 more strophes per minute compared to older males of the species.