Among the three zones, wetland is the least used (ideally, you shouldn’t use it more than 4-5 times per game), so good abilities there less useful — except for draw / cycling abilities that let you reduce the number of those actions. Therefore, among the three locations, abilities in the wetland are the least useful.
As for the BushTit, I don’t like its food to points ratio - 2 points is very little for two food. To get more points, you need to have spare cards, which in most cases means something in the game went less than ideally. Moreover, if you think about it, double activation of the Bushtit lets you convert two cards into 4 points, but two cards often equal one action in the wetland — an action you could have spent on something that gives more than 4 points at the end of the game. Of course, it allows you to get rid of unwanted cards, but those cards can be used in other ways — discard them for food, cycle them, or in the end simply keep one extra card in hand, since a single activation of the Bush Tit isn’t that good. Also, the cost of two food makes it expensive for the early game, while two points are usually too few for rounds 3–4.
On the plus side: the nest (which is why people usually take it) and the possibility of getting a few extra eggs early on, which could potentially save back you a turn.
As for the BushTit, I don’t like its food to points ratio - 2 points is very little for two food. To get more points, you need to have spare cards, which in most cases means something in the game went less than ideally. Moreover, if you think about it, double activation of the Bushtit lets you convert two cards into 4 points, but two cards often equal one action in the wetland — an action you could have spent on something that gives more than 4 points at the end of the game. Of course, it allows you to get rid of unwanted cards, but those cards can be used in other ways — discard them for food, cycle them, or in the end simply keep one extra card in hand, since a single activation of the Bush Tit isn’t that good. Also, the cost of two food makes it expensive for the early game, while two points are usually too few for rounds 3–4.
On the plus side: the nest (which is why people usually take it) and the possibility of getting a few extra eggs early on, which could potentially save back you a turn.