Lara has unlimited ammo for these and will always carry two of them. They are not very effective, but most of the mortal opponents, except the skeletons and mummies in The Last Revelation, can be killed with them. If you run and jump around a lot and circle your opponents they will suffice most of the time, even against a bigger opponent like the demigods or the T-Rex.
In Tomb Raider: Anniversary, Lara uses Colt Mark IV 1911 pistols, apparently chambered for .357 caliber ammo (.357 can be seen stamped on the side in some cut-scenes, notably when fighting the T-Rex). They feature 20-round magazines and must be reloaded manually, but have unlimited ammo.
To unlock the birds, you have to do the missions. There are 6 birds in the game and Red will be unlocked immediately when you first start playing the game. To unlock Chuck, you have to complete the tutorial and you'll meet Chuck after you saw him has been attacked by the Chef Pig and his ship. You have to fight 30 times to unlock The Blues. You have to get 30 items to unlock Bomb. Try to defeat 10 Challenge Bosses with a three-star rating to unlock Matilda and support your friends 10 times to unlock Stella. You can also unlock the birds immediately by using 6 gems. If you don't use a bird for a long time, the bird will get angry, which means its attack and defense will be boosted. Your bird will calm down after one battle.
The six birds in this game can change the weapons, hats, and accessories. Weapons help you to have attack power to attack your enemy. Hats help you to increase defense-boost. Accessories have skills that will help you in the battle. These items have five ranks: C, B, A, S, and SS. These items can be enhanced with an amount of coins. You can get Rank B and C items (you can even get a Rank A or Rank S item sometimes) after fighting and you can get items from Rank A and above in the Slot game. You can get those items as a reward in the area's missions and events. Your ship can change the bow, the mask, and the deck. These items also have five ranks: C, B, A, S, and SS. You'll get these items from the area's missions, from the Slot game, and from the events. Some of these types of equipment have skills to help you during the battle. You can increase your experience and level when you fight with the enemies. And also remember, the higher level your birds are, the more things they (or your ship) can carry. The total weight of your bird's (or your ship's) equipment and the maximum weight that your bird (or ship) can carry is next to the symbol. If the equipments' total weight is higher than the weight that your bird can carry then your bird can't able to equip them. And if your ship's equipments' weight is higher than your ship's weight then your ship will not able to equip it too. The game features two kinds of currencies: Bird Coins () and Gems (). You can use coins to enhance your equipment and use gems to refill energy, unlock birds or playing the Slot game. The Slot Game requires 5 Gems to open Mighty Eagle's Treasure Box. There are two kinds of energy: Original Energy and Ship Energy. Original Energy will be refilled as 1 point every 10 minutes and used for PvP levels (not including the Arena Event levels). Ship Energy is used for Boss and Monster Event Levels and will be refilled 1 point every 30 minutes. 2b1af7f3a8