Swan Knob Size Misconception

Text on the meme

Male - Small Knob Female - Large Knob Knob Size is NOT Reliable to determine SEX.

What it means

Two white swans float on a pond, with captions claiming that the male has a small knob and the female has a large knob. The punchline warns that knob size is not a reliable way to determine sex, humorously presenting an odd animal-identification fact in a suggestive way.

Objects

white swans / белые лебеди pond water / вода в пруду orange beaks / оранжевые клювы black facial markings / чёрные отметины на лице feathers / перья shoreline / берег grass / трава water ripples / рябь на воде floating birds / плавающие птицы