A study examining the gland's mass relative to body weight in 126 bird species showed the absence of a clear-cut correlation between the gland's mass and the degree of birds' contact with water.
Un estudo que examinou a masa relativa da glándula con respecto ao peso corporal en 126 especies de aves indicou a ausencia dunha clara correlación entre a masa da glándula e o grao de contacto das aves coa auga.