
Today I learned that birds and reptiles can isolate infections in a single part of the body instead of the spread that often happens in mammals. I want to go read about how that works now, but I guess my theory would be a different lymphatic system? Though no clue how they would avoid spread through the blood stream... If someone finds out before I do, let me know!
(Note that I studied immunology as part of my degree, am interested in *detail*.)