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Bats, I want their crazy advanced immune system and interferon production. Bats are tiny mammals with a metabolism even faster than a rat/mouse due to the high energy needs of powered flight. Typically, small mammals with this fast of a metabolism will live like 2-5 years, because cell division is so rapid that after only a few years, the cells' DNA becomes too damaged to continue. However, bats have insane immune systems. They're immune (asymptomatic carriers) to nearly every virus capable of infecting them because their immune systems produce so much interferon that any damage to the DNA (eg from a virus inserting code for its own reproduction into a cell) is corrected almost immediately. This process also partially repairs damage from cell-division, meaning that bats can live up to ~40 YEARS depending on the species. If a human had that ability, it would be like living to 400 or 500 years old, and being immune to nearly every disease (between native viral immunity, and antibiotics for bacterial infections)
Also Monitor Lizards. They're the most intelligent squamate reptile (group that includes all living reptiles except turtles, crocodilians, and birds, who are archosauromorphs), except for possibly the cobra. But, they're still cold-blooded, so I can just nap on a hot rock without eating for 2 days and be Fine. They do get Stupid when the temperature drops too much (lowers their metabolic rate, and intelligence uses lots of energy), but I live in Florida, so that's fine💀. They're also one of the only lizards that can both breathe and walk at the same time (apparently most squamate reptiles use the same muscles for breathing as moving their forelimbs?? Wack.). This is how they became so intelligent, there was more O2 coming into the body, so the overall metabolic budget to evolve stuff like Large Brain became much larger.
Also they're adorable, monitor lizards can be so friendly, curious, and playful, they're like the Lizard version of cat imo. I really want one, they even like to cuddle (humans are Warm, and they're smart enough to recognize and trust you enough to want cuddles). I'm gonna get a cute little Ackie monitor once I graduate college I think.