NASA developing robot bees for Mars exploration

The Marsby is a small, bumblebee-sized robot designed to operate on Mars using a Rover as a mobile base. It can stay airborne for 4-6 hours and features a flapping wing design to optimize energy use in low Martian gravity. Equipped with sensors and wireless devices, Marsby will map the Martian surface and search for methane, a potential indicator of life.

What design feature helps the Marsby absorb wasted energy?

What is one of the key indicators of life that the Marsby will search for?