Senenzon wrote...
What if theres a little tail under that suit 
I can imagine Tali wiggling her little tail when shes excited:O
Sorry for replying to post 10hours old, but I'd like to comment on probable Quarian anatomy origins.
Seeing Quarian legs build similar to earthy dogs or cats or in general to most placentals carnivora, it is safe to assume that they share ancestry with creatures of similar look. So they are expected to have some remains of tail bones, even humans do. It seems resonable enough to think they may still have some short tails lest, as they presumably were carnivorous - runner predators, and tail would help them maintain stability when running.
So yes - I belive Quarains have some sort of short tail, maybe just couple inches long.
As for the whole if Quarians have hair discution, I say it is imposible to determin without seeing native Ranoch fauna. On Earth most surface animals have some, and it is Asari "baldness" which seems unbecoming and hard to explain. The question is if Quarian life style to live in sterile enviroments even before leaving Ranoch, caused body hair to retract and decline. Id say they are compleatly hairless apart to their heads.
Pure science fiction there not all complementary knowledge there.