Woodcutting

Woodcutting is not a major skill for non-members, serving only as a supporting skill for firemaking.

For members, it serves as a supporting skill for fletching, with ordinary logs for arrow shafts, and better logs for bows to build fletching experience. There are also some member quests where it is used. I someone is buying logs of any kind, they are probably a member practicing fletching.

You can use any axe (Hatchet) for woodcutting, with no level requirement, so as you advance your smithing level, you can make and carry a better axe.

Levels
Oak or better give multiple logs per tree. Following a common convention members trees are shown in italic.
 * (1) Normal tree, Evergreen, Dead and the Achey used in Big Chompy Bird Hunting quest
 * (15) Oak
 * (30) Willow
 * (36) Dramen, used in Lost City quest
 * (40) Swaying, used to make lyres, found in Relleka
 * (45) Maple
 * (45) Hollow, used to make splitbark armor, found in Canifis
 * (60) Yew, these are marked on maps, but are not exceptionally rare
 * (75) Magic

Random events
All the general random events can occur, but some are specific to woodcuting.

Tree Spirit
Similar to the River Troll when fishing, or the Rock Golem when mining, this is a fairly tough opponent based on your combat level. If you want to see one, loiter around the busy willow cutters at Draynor and you're bound to see one, but you can only fight your own.

If you only have logs, run, but if you have food, fight them, as their best drop is a decent number of Nature runes that can be used or sold.

Ent
If the tree begins to shake, it is coming to life as an Ent. If you continue cutting, it will break your axe.

Bob's Axe's in Lumbridge will fix it, for a price, though if you use a self-smithed axe, just dump it and go and smith another.

Lost axe head
If the head flies off your axe, just pick it up and put it back on the handle. You have a limited time to collect it, before others can see it.

Dr. Ford
You're dazed after being hit by a branch. Which fingers is he holding up?

Get it right, get some fruit, get it wrong or ignore him, and you'll take a forced rest.

Bird's nest
A birds nest falls from the tree and lands beside you.

Pick it up and search it, as it may contain a valuable item or a coloured birds egg of no known current use.

There is speculation that there may be a later task which requires a set of coloured eggs, or they might be a "rare" item with no useful purpose, but a value that depends on demand. If you get an egg, best to hang onto it for now