The Caatati are a warp-capable species
from the Delta Quadrant. They are a reptilian humanoid species.
The species was assimilated by the Borg. Only 27 ships
of Caatati remained. Their technology used thorium and they were slowly running
out of the element. They had also the ability to replicate it.
The U.S.S. Voyager came across a Caatati ship. The
Caatati ship located Voyager's warp core. They tried to bargain the warp core
for more food, however, Voyager crewmember Seven of Nine gave them access to
their lost thorium replication technology. The Caatati gave Voyager back its
warp core.