Four Females And One Male!

"I'm no bird expert, but I'm guessing four females and one male." 

Can you tell us why the meme creator thought there were four females and one male? The chirping birds have their mouths wide open as if they are screaming/arguing and that made them look like girls. Come on; it's just a joke! Interestingly, the so-called male bird looks scared and it is hiding behind those four birds like a wimpy little creature!