1. Alligator: normal, crocodile, giant versions of each
2. Ant: giant, giant fire
3. Bat: normal/swarm, giant, mobat
4. Bear: black, cave, grizzly, polar
5. Birds of Prey: eagle, falcon, hawk, owl, raven, vulture, (normal and giant versions of each, % chance to be intelligent/speaking.)
6. Boar: normal, giant
7. Cat: domestic, lion, lynx, puma, sabertooth, tiger, (normal and giant versions of each)
8. Deer: stag, elk, moose (normal and giant versions of each.)
9. Dog: domestic, hunting/hound, guard/mastiff, wild
10. Dolphin: normal, telepathic
11. Elephant: normal, mammoth
12. Frog: giant, poisonous, toad/giant and poisonous
13. Furry Woodland Creature: Badger, Beaver, Ferret/Weasel, Fox, Otter, Rabbit/Hare, Squirrel (normal and giant versions of each, % chance to be intelligent/speaking.)
14. Herd Animal: antelope, bison, camel, cow, sheep, wildebeest, yak, zebra
15. Horse: draft, riding/light, war/heavy, wild
16. Rat: normal, giant, swarm
17. Scorpion: normal, giant
18. Shark: normal, giant
19. Snake: poisonous, constrictor, two-headed (normal and giant versions of each.)
20. Spider: poisonous, bola, tarantulas, wolf, large and giant versions for each
21. Turtle: giant, giant snapping
22. Wolf: normal, giant, winter
1. Ankheg
2. Basilisk
3. Centaur
4. Dragon: Start with a list of 8 (so as not to overwhelm). 1 good and 1 evil for each of the 4 elements, maybe? Soooo, something like: Gold/Red (fire), Silver/Blue (air), Bronze/Black (water), Copper/Green (earth)
5. Dryad
6. Dwarf: Hill, Mountain, Deep
7. Elemental: air, earth, fire, water (normal and giant versions and 1 "humanoid" creature for each: sylph, gnome, salamander, undine)
8. Elf: Dark, Grey, High, Wood
9. Faerie: Brownie, Pixie, Sprite
10. Giant: fire, frost, hill, stone, storm, wood(treants
11. Goblinoid: Goblin, Hobgoblin, Bugbear
12. Golem: Crystal, Flesh, Iron, Stone, Wood
13. Griffon
14. Harpy
15. Human: Bandit, Barbarian/Berserker, Nomad/Tribesman
16. Kobold
17. Lycanthrope: Were-bear, boar, cat (lion/tiger/etc), rat, wolf
18. Manticore
19. Medusa
20. Monstrous Vermin: Carrion Crawler, Rust Monster, Stirge
21. Ogre: normal, two-headed (ettin?)
22. Ooze: Gelatinous Cube, Green, Grey, Yellow
23. Orc
24. Pegasus
25. Troll
26. Umber Hulk
27. Undead: Ghoul, Ghost, Skeleton, Spectre, Vampire, Wraith, Zombie
28. Unicorn
All of the above go into the DMG.
The following could go into the Player' books, per MarkCMG's recommendation for mounts or familiars and a la Crazy Jerome's "stat/lore."
Fully statted for use/options as Mounts, Familiars (and/or Animal Companions if your game/DM allows/uses them):
1. Bat: normal/swarm
2. Bear: black, grizzly, polar
3. Birds of Prey: eagle, falcon, hawk, owl, raven, vulture (normal and giant)
4. Boar
5. Cat: domestic, lion, lynx, puma, tiger
6. Deer: stag, elk, moose
7. Dog: domestic, hunting/hound, guard/mastiff, wild
8. Elephant
9. Furry Woodland Creature: Badger, Beaver, Ferret/Weasel, Fox, Otter, Rabbit/Hare, Squirrel (normal and giant)
10. Herd Animal: antelope, bison, camel, cow, sheep, wildebeest, yak, zebra
11. Horse: draft, riding/light, war/heavy, wild
12. Rat: normal, giant, swarm
13. Snake: poisonous, constrictor
14. Spider: poisonous, bola, tarantulas, wolf, large and giant versions for each
15. Wolf: normal, giant
With a note that other animals are available from your DM as makes sense for your character's background i.e. a PC from a coastal town might get access to dolphins and sharks. One from a desert region could have access to scorpions.
"Common Knowledge/lore" List:
No stats. Just explained in the most generic terms. Just what a "common person" would think/might know about when someone says "dragon" or "fairy" or "goblin"...and basic info that would be common knowledge.
For example, maybe including under the Lycanthrope entry something like, "It is said those cursed with this unnatural affliction are averse to silver."
But no actual in-game rule/crunch such as "They can only be hit with silver or magic weapons."
(I'm getting images for all kinds of cooooool watercolory representations of each, a la the Brian Froud/Alan Lee
Faeries and
Gnome books...)
ANYwho, here's that list:
1. Dragon
2. Dwarf: lore fitting Hill variety only
3. Elf: lore fitting High variety only
4. Fairyfolk
5. Goblinoid: Goblin, Hobgoblin, and Bugbear
6. Kobold
7. Lycanthrope: Wererat and Werewolf only
8. Ogre
9. Orc
10. Pegusi
11. Troll
12. "The Undead": skeletons, zombies and ghosts only.
13. Unicorn
So, combined/intermingled, a Player's book "Creature" section totals under 30 (28) entries...and some of those entries are truncated compared to what the DM has access to (cave bears, sabertooth cats, additional undead and lycanthropes, etc.).
I'm just imagining those BLISSFUL DM moments when you describe a monster or it makes an attack, let's say a vampire for argument's sake, and the players' face go aghast in absolute abject HORROR shouting "HOLY $%@^!!! That's not in the book!!!!" and the DM gets to give that oh so deliciously subtle grin and whisper, "It's in mine."

BWAHAHAHAHA! <thunder crashes>
Seems like a nice compromise to between "Don't let the player's see anything" and accommodate the "Makes sense to give the players info on things they might use, would know or have heard about."
What do we think, gentlefolk?
--Steel Dragons