It's very hard to discern the difference between "ellos" and "ellas" in the recorded voice. In general, for whatever reason, I find the male speaker on Duolingo easier to understand than the female speaker.
Once again the woman speaker does not enunciate and I cannot tell what she is saying. She pronounced ellos as ellas. Why won't you fix this problem? I'm thinking I might as well switch to babbel because you won't even respond to my multitude of complaints.