Marten food in RAV4?

Hello dear forumists times a question about the RAV4 and rodents. Recently again a look under the bonnet and seen the following. Otherwise there are no battle tracks to see. Interesting is, that exactly the same damage had one of the demonstrators, which I drove to the rehearsal at the time. Otherwise I did not see any bite marks. Does anyone else bite at this hose sheathing? What kind of hose is that? And why is it isolated? Is it even biting?