assign_eagle_gender_effect

assign_eagle_gender_effect = {
	save_temporary_scope_value_as = {
		name = gender
		value = flag:$GENDER$
	}
	if = {
		limit = { scope:gender = flag:random }
		hidden_effect = {
			random_list = {
				80 = { # Female eagles are thought to be larger / fiercer
					set_variable = {
						name = eagle_gender
						value = flag:female
					}
				}
				20 = {
					set_variable = {
						name = eagle_gender
						value = flag:male
					}
				}
			}
		}
	}
	else_if = {
		limit = {
			OR = {
				scope:gender = flag:male
				scope:gender = flag:female
			}
		}
		set_variable = {
			name = eagle_gender
			value = flag:$GENDER$
		}
	}
}

As written in game/common/scripted_effects/00_animal_effects.txt.