Plumule and Penna

Plumule noun - Down feather of young birds; persists in some adult birds.

Penna and plumule are semantically related in plumage topic. In some cases you can use "Penna" instead a noun "Plumule", when it comes to topics like medium external feather.

Plumule and penna are semantically related in plumage topic. You can use "Plumule" instead a noun "Penna", if it concerns topics such as medium external feather.