It's not silly at all. Predators make a point of keeping quiet, and all animals that have predators instinctively know that anything that is vocalizing near them is not fixing to eat them.
Yes, this is true.
Predator instinct is also what makes my cat rush over to check on me if I trip over her.
She isn't concerned that I am hurt, she's just checking to see if I am too hurt to feed her.
If I am too hurt to feed her, she'll check to see if I am hurt enough for her to take down..
;-)