I didn't really appreciate SluggerBaloney's tone. So it bothers me to agree with some of its points, but let's explain it!
For some time now, my playstyle has been based primarily on the idea of playing in the forest as little as possible (preferably not at all) as a default strategy. I'll try to explain how and why.
FrankJones, you mentioned that there are 5 cards that allow you to gain food from outside the forest. That's not exactly true (you said so yourself), because there are actually 6 more that are "social" birds, which share their gains with everyone. There are also (at least) 5 more that allow you to gain food passively (pink power), and 3 others that allow you to gain food the moment they are played.
Personally, I particularly like 10 birds that I consider very effective at providing me with food (5/6 of which are social birds).
Based on this, if I don't have any of these 10, I generally keep only a few birds at the start, favoring wetland and/or tucking birds.
With this, I can see a lot of birds, often having some food to use when the time comes.
For me, cards are the most powerful resource in the game.
- Building a powerful card deck as early as possible gives a significant advantage in making subsequent moves as efficient as possible because you know more precisely where you're going.
- A card can also be tucked in exchange for an egg/food.
- A card can be traded for food in the forest. And this is a huge point I "discovered" recently. If I draw two card, I already theorically gain two foods, but in the same time knowing which food I need because I already have cards (well it's two card or two foods or 1 and 1, not both, I know).
With this strategy, I often know where I need to focus my efforts to be most effective. I might occasionally be forced to make a few moves in the forest if necessary (with one or two birds placed, depending on the number of cards I can trade with their potential value later in the game). I might also completely shift towards a full forest strategy (if I have the right cards for it).
I don't want to claim that this strategy is the best, as it certainly has its flaws. It requires considerable experience with the game, as you need to know which cards to keep, anticipate the food you'll need, and so on. It's therefore less reliable than a strategy that focuses on building a forest with at least two food resources as early as possible, which I recommend for all beginners (and which is also used by most of the best players, from what I've seen). It can (rarely) lead to catastrophic situations.
I can also say it does not imply to all games (you need good wetland birds or tucking birds in grassland)
I simply wanted to lend some credence to this idea that SluggerBaloney mentioned, which better suits my playing style and gives me better results.