Animals!

I like this one a bit better than the Nyambe one (higher dex and con but only has a +4 racial bonus to disease) Some poisons do work on vultures though.

Yeesh, my game is off today don't mind me

Edit: Decided to include an animal of my own, originally posted on rec.games.frp.dnd by me, edited though because I have a better understanding of monster blocks.

Platypus
Tiny Animal
Hit Dice: ¼d8+1 (2 HP)
Initiative: +1
Speed: 5 ft, 30 Swim, burrow 5
AC: 12 (+1 Dex, +1 Natural)
Attacks: Bite +1 melee, Kick +1 melee
Damage: Bite 1 kick 1 (poison
Face/Reach:
Special Attacks: Poison for males.
Special Qualities: Blind Sight, Cold Resistance: 5
Saves: Fort:+3, Ref:+1, Will:+1
Abilities: Str:10, Dex:12, Con:12 Int: 2, Wis: 12, Cha:8
Skills: Swim: +12 Hide: +3
Feats: Nil
Climate/Terrain: Any Temperate Fresh Water
Organization: Solitary, Pair, or Family (2-4)
Challenge Rating: ½
Treasure: Nil
Alignment: Always Neutral
Advancement: 1-2 HD (Small) 3-5 HD (Medium)

Combat

Blind Sight: While underwater Platypi can ascertain all foes within 40 feet as a sighted creature would. Beyond that range, they treat all targets as totally concealed. This ability is due to electrosensors in the Platypi’s bill.

Poison: Fortitude save DC: 14. Initial Damage 1d2 Con, Secondary damage 1 Con

Platypus as familiar
+2 to Swim, immunity to platypus poison

The poison is about a billion kagillion squizxillion times more powerfull. But balance and stuff, yeah.

Now corrected to two HP.

And the only mention of the poison I found at the time just mentioned that it made humans deathly ill. Not fatal to my recollection.

Here's a non-existent animal (just for fun ):

Miniature Rhino
Small Animal
Hit Dice: 1d8+5 (9 hp)
Initiative: +0
Speed: 20 ft.
AC: 16 (+1 size, +5 natural)
Base Attack/Grapple: +0/-1
Attack: Gore +4 melee
Full Attack: Gore +4 melee
Damage: Gore 1d6+3
Face/Reach: 5 ft. by 5 ft./5 ft.
Special Qualities: Low-light vision
Saves: Fort +4, Ref +2, Will +1
Abilities: Str 16, Dex 10, Con 14, Int 1, Wis 13, Cha 3
Skills: Intuit Direction +2, Listen +4
Feats: Toughness

Climate/Terrain: Warm plains
Organization: Solitary or herd (2-12)
Challenge Rating: 1
Treasure: None
Alignment: Always neutral
Advancement: 3 HD (Small); 4-6 HD (Medium-size)

A miniature rhino looks like a smaller version of a normal rhinoceros. There are black and white miniature rhino’s. Just like normal rhino’s, these creatures are very strong and tough.

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It's maybe a bit too weak for CR 1, but too tough for CR 1/2. Any input on that is highly appreciated.