…FROGS AND FRESH MILK?
Frogs, like all amphibians, have thin, porous skin that they can breathe through. But this also poses a risk because it makes it easier for bacteria to infect them.
To protect themselves, frogs secrete substances called cationic antimicrobial peptides (CAMPs). Other animals secrete CAMPs too, but frogs produce much more, including some peptides that are effective against multiresistant bacteria.
Milk goes off because of bacteria, especially species of Lactobacilli and Pseudomonas. These ferment the lactose in milk into lactic acid, and hydrolyse milk proteins into various unpleasant tasting by-products.
According to Russian folklore, putting a live frog in milk would help it stay fresh. Recent research has found that CAMPs from the Russian brown frog could kill the bacteria in milk and prevent it from turning.