Horror films with tiny terrors?

What are the horror films that have people attacked by things the size of a rat or smaller? So far,, I've got...

Birds
The Birds (1963)

Bats
?

Bees
The Swarm

Rats
Willard (71)
Ben (72)

Bugs
Bugs (75)

Spiders
?

Worms
Squirm (76)

Fish 
Piranha (78) and later versions

Other
?

The 70's seem to have been the heyday for this type of film