These are the animals which you can summon by using the Archers !Animals ability. One is chosen at random when you use the ability, so you never know which animal you'll get. But it seems that some animals only show up when you've reached a certain level. For example, the Unicorn and Wild Boar appear much more frequently when the summoning character is at a reasonably high level, while at very low levels you tend to get stuck with the Mysidian Rabbit a lot more often.
Here's the list of all animals I've seen, and what they do.
Damages all enemies.
Hits one enemy for 3/4th of its remaining HP.
Distracts all enemies for a few rounds, much like the !Flirt ability.
Doesn't do a thing!
Heals all party members.
Attempts to Poison and Blind all enemies.
Damages one ground-bound enemy, chosen at random. Fails if it targets a flying enemy.
Heals all party members. More powerful than Nightingale.
Damages one ground-bound enemy, chosen at random. Fails if it targets a flying enemy. More powerful than Squirrel.