And I'm not talking about the cartoon. Bonsoir mes ches lecteurs, comment ça va? look at this little curiosity I found.
By tweaking this rodent's genome (specifically the gene responsible for the PEPCK-C), they managed to enhance it, to the point that it can run at a speed of 1.2 Km per hour for about six hours. Talk about endurance.
This little achievement is explained by the extra mitochondria in their muscles, which also explains why they eat twice as much but weigh half as much as a normal lab mouse since they burn whatever comes in.
There is a little side effect, though. These overpowered mice happen to be rather aggressive.