Su suggerimento di @Persiles.
Un articolo pubblicato su Aeon spiega i meccanismi di comunicazione del dolore negli animali.
If you watch kids at a local playground, sooner or later one of them will run around and fall face-first to the ground. For a moment, there’s likely to be silence. Then the child will look around, catch a glimpse of their parent, and finally burst into a deafening wail. The sequence of this child’s cry is no accident: it is a signal.
Immagine da Flickr.