So far, party chat has consisted of a quick "hi" amongst the turtles. Mafia chat has been very active... I think this tends to happen with newer players.
Look, I know you guys think a publicly controlled cop ability and doctor ability is something really awesome and useful. But I hate to break it to you... your weapons are pretty weak. And mafia's weapons will be much stronger the longer you mess around. Saying "we must preserve these powers at all costs, because they are townie powers" is a way to look good to other townies, not a viable strategy for the long run.
A turtle party with a mafia member in it will NEVER save anyone's life. The best it can do is influence a kill not to hit a cop recipient. And even if you've got that, if the mafia has someone in the bird party, they can just kill the cop target, and town learns NOTHING. Assuming that target actually is town, which is something they can argue subtly to get. And even then, they can just kill someone else to confuse you. Oh, and what if the recipient is mafia?
Basically the only case in which Turtle + Bird gets you useful information is when you hit mafia directly, and even then, there's going to be a little uncertainty over whether the cop target or recipient is the true villain.
So, if you're lucky you might find scum using this. Let's say if you tried it three times, you'd hit scum once. Is that good enough? How long can you play this game?
3 town vs 3 scum is obviously a scum win -- all scum should be in bear so town can't catch up on kills.
4 v 3 is a scum win if town doesn't control bear from the start.
5 v 3... hmm... scum speedlynch or speeddeadlinelynch is possible...
6 v 3 means a mislynch leads to 4 v 3, so you better all plan to move to bear. Also, if 2 town votes land on the same townie, scum speedlynch is possible, and town better have planned to ALL move to bear before the lynch.
See what I mean? There comes a point very soon where scum doesn't even care if you've copped them.
OTOH, suppose you decide that the current party setup is overrated and abandon them all together. You can dissolve Bear and Fish easily enough, and Monkey too. Then you're left with a very standard game, and more time to find mafia.
Or, have everyone go bear, and kill anyone who doesn't comply. You might need to worry a little about Fish, but not much. Standard game otherwise.
Or, have everyone go bear, except for a few people that are found suspicious. Lynch anyone who doesn't comply. Town now has a double lynch. (This is EP's strategy.)
Just don't get so upset about losing your weak powers of Bird and Turtle that you leave scum with all of their strong powers available.