How to eat it:Edit
You must bite its tail to the red circle. After doing it, it will anger the barracuda to chase you. It will eat nothing in its path. Like the intruder, it will let you after some time. Do this carefuly 4 times to make it shrink and become eatable. You can only bite its tail when the red circle appears. This won't work for Goliath because he can eat them.
Can be bitten four times to shrink it.
Eating a Shrinkshroom will never make it small.