Summary
When a predator bites, the hagfish instantly gushes out gallons of slime that clogs the attacker's gills. Deep Look reveals how this deep-sea fish turns water into a gooey escape in the blink of an eye.
Viewer safety
Ages 7+Mild peril
Deep Look films tiny creatures in extreme macro close-up, so a squeamish class may find this one intense — preview if that's a concern.
Our rating is a quick teacher-to-teacher guide — preview before showing.
Teaching resources
Discussion questions
Talk about it
The hagfish can't bite or swim fast, so it defends itself with slime. Special glands release tiny fibers that swell in water into a choking, slippery cloud.
- How does slime help a hagfish escape a predator?
- Why is a defense that works instantly so valuable?
- What kind of predator would slime work best against, and why?
Quick work-a-long
Vocabulary: slime, gland, predator, defense.
Try it: Stir a spoonful of cornstarch into a little water. Notice how it changes. Write how a slippery, swelling goo could stop an attacker.