STO: Mantids are a very rationally-oriented people who evolved from insects. They thrive everywhere because of their ability to adapt harmoniously.
STS: Mantids are a very rationally-oriented people who evolved from insects. They are master geneticists and have modified their genes to thrive everywhere.
Mantids start with either additional population or an additional level in Genetics, depending upon the alignment. Additionally, they can grow their population twice as fast as normal. Therefore the best strategy is to seek stars that allow room to grow.