Name an animal using the last letter of the previous post

Thresher Shark.

A beautiful fish, part of the mako shark family.  They can reach top speeds of 22 miles per hour! 

Tail-light tetra.

It gets its name from an evolved self defense mechanism. Iit has bright, reflective patches near its tail and behind the eyes, so predators cant work out which end is the head. They look like little car headlights.