yeah really interesting in this case both come from Latin, and both made their way in the modern languages, one in its masculine form the other in its feminine form.

• Pullus (adj.) very small (animal), a young rooster, "pulla" for the female chicken. French : la poule
• Gallus (name) rooster, "gallina" for the female chicken. French : le gallinacé (a chicken specimen, member of the species Gallus domestica)