Collocations for extinct - adj.

be
become, go
make sth
presume sth, think sth
The species was presumed extinct.

completely, totally
long
Dinosaurs are, of course, long extinct.

all but, almost, nearly, practically, virtually
The numbers of these animals have been falling steadily and they are now almost extinct.

Extinct is used with these nouns:
animal, bird, mammal, species, volcano