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[JadeToad]

i settled in a broad leaf forest and this flock of giant wrens has been in the area for a whole ingame year!
how do i make them leave?

[DoctorDorf]

Crossbow bolts!

Or you could try and capture them in cage traps somehow, and set up a massive bird farm.

[JadeToad]

Crossbow bolts!

Or you could try and capture them in cage traps somehow, and set up a massive bird farm.

if i kill them all will new animals come in?

[DoctorDorf]

I'm unsure. From what I can find killing a certain animal type on your map will increase the chance of a new group wandering in (could be the same animal though; https://www.reddit.com/r/dwarffortress/comments/6is0nx/science_on_wildlife_spawning/).

That thread also mentions that there is an upper cap on the number of animals, which implies that you can kill all of them and never see another again. However, the thread says that is specified by the [POPULATION:CAP] tag in the raws, which as far as I can see doesn't exist for [CREATURE:GIANT_WREN]. The most similar tag is [POPULATION_NUMBER:15:30] which specifies "The minimum/maximum numbers of how many of these creatures are present in each world map tile of the appropriate region" according to the wiki. Unfortunately I can't tell you whether that means "if giant wrens appear, you won't ever see less than 15 or more than 30 per map tile, but there might be more breeding etc in other map areas", or "Every world map tile with the right biome will generate between 15 and 30 giant wrens and that is all the giant wrens this world will ever see".

[PatrikLundell]

Camping critters is a long standing issue. I've noted that if you trap one of a group the rest of the group has an increased risk of camping, and butchering the trapped one(s) have a chance of getting them to move.
Killing them works, though.
There's a limit to one critter group per level (surface, each cavern) at a time (two if there's a savage biome on the embark), so a camping group (which may be one critter) will block a group until it moves away or is killed.
There is a limited number of creatures in the world (excepting ones that are "innumerable", such as bees, many kinds of vermin, and clowns). However, the raws provide starting values for RNG generation, not absolute numbers. The DFHack command region-pops info (if I recall it correctly) shows what's available within a 7*7 world tile area centered on the embark, and it is possible to exterminate a species locally.

[Leonidas]

As soon as you kill a group, or it leaves, the next group arrives. This also applies to each cavern. You can take advantage of this fact to farm cavern creatures.

[daggaz]

You have giant wrens.  This is MUCH BETTER than having giant keas.  Be good to your wrens.

[Halnoth]

Ya giant keas suck. So far this embark, giant keas have killed 8 dwarves. They are terrible creatures.