The vividly described world of the Chronicles includes a diverse host of animals - some familiar to us, and some uniquely original. Follow this link for information on The Swarms.
There are several taxonomic systems on Olo Malan, including the Ilapatarginath [X p. 258], and the Hindrix-Prodorgotz [VI p. 6].
'A quokka?' said Guest. 'What in the name of Behenial is a quokka?'
'What, for that matter, is Behenial?' said his father [X p. 474]
Smoke Parasite Smoke Parasite He's right, said Miphon. Stay away for the moment. The smoke is parasitic, but the light will weaken it. Soon it'll trouble him less, and be too weak to batten onto anything else. ...
Snail, water Snail, water
Snake Snake VI p. 369
Snake, copper-strike Snake, copper-strike
Snake, Rabbit Snake, Rabbit III p. 332
Sparrow Sparrow II p. 68
Sponge Sponge I p. 7
Stalker Stalker
Starfish Starfish [III p. 346,
Stink lizard Stink lizard III p. 332
Swamp dragons Swamp dragons These creatures are not true dragons any more than an ork is a true whale, but the naming of things proceeds without regard for scientific taxonomy, hence dragons they were to Galsh...
Swarms Swarms the creatures of the Swarms are dealt with in a dedicated article.
Taniwha Taniwha found in Quilth [I p. 45]. Doesn't feature in any of the books, but here's a Wikipedia article http://en.wikipedia.org/wiki/Taniwha
The Swarms The Swarms
Thog Thog IX p. 35
Thrush Thrush II p. 68
Toad Toad X p. 468
Tunneller Tunneller
Turtle Turtle II p. 254
Unicorn Unicorn VI p. 262