Many species of animals have become extinct during the last hundred years.

aggressive : ready or likely to attack or confront; characterized by or resulting from aggression.
non-existent : not existing or not real or present.
scattered : occurring or found at intervals or various locations rather than all together.
feeble : lacking physical strength, especially as a result of age or illness.
extinct : no longer in existence.


Synonym of extinct is non-existent