A toxin produced by a sea snail contains a variety of proteins  After one of them is injected into a mouse, it will cause a two-week-old or younger mouse to fall into a sleep state and the larger mouse will hide
When the mouse is suddenly exposed in the case of a serious threat, the very small mice reacted to be stunned, while the larger mice would run away
The Rats' response to sudden and severe threats was stimulated by a chemical produced in their bodies that was similar to a protein injected into the mice.