Shriekers are aerial predators found in Torvus Bog on Aether and relatives to the Shredder. They attack by firing sonic blasts, in the time it takes to charge them, they are invisible. Samus can only target them while they are firing the blasts. However, if she has the Echo Visor, she can target them at any time.
- "A cousin to the Shredder, the Shrieker waits for prey half-buried in the earth. When it detects a target, it erupts from the ground and takes flight. It releases a sonic blast to stun its target, then sweeps in to feast. Shriekers can generate a stealth field that disrupts most Visors, making them difficult to attack." — Logbook "Shrieker" (Metroid Prime 2: Echoes)