extremely rare

Translations
чрезвычайно редкий
This species of bird is extremely rare.
Этот вид птиц чрезвычайно редкий.
Definitions
A term used to describe something that occurs very infrequently or is found in very limited quantities, making it highly unusual or uncommon.
Words
extremely

adverb
чрезвычайно
rare

adjective
редкий