Drosophila melanogaster

This little insect here is called Drosophila melanogaster, although friends refer to it as 'fruitfly'. This being might seem irrelevant at first glance, but it is helping researchers all around the globe to unravel many aspects of how genetics work, from development to brain diseases.

Wanna know more? I strongly suggest you to read the following review, there is no harm in a little history.
Letsou, A., & Bohmann, D. (2005). Small flies? Big discoveries: Nearly a century of Drosophila genetics and development. Developmental Dynamics, 232(3), 526–528. https://doi.org/10.1002/dvdy.20307