Percentage based traits are based on the total number of animals with the same trait.  The fewer animals with that trait the higher the trait number.  There are a few traits that have set values that are not based on % or total count.

Gender ~ This would only count for more value if one gender were harder to get.

Species ~ Traits are assigned based on total count.

Breed ~ is less then 50 % counts as 2 Traits.  There are bonuses put in place now for newly discovered animals.

Fur ~

Bonus applied if less then 500 of the animal type is on the grid.

Rarity of 0 – 25% = 3
Rarity of 26 – 50% = 2
Rarity of 51 – 75% = 1
Rarity of 76 – & Up = 0

Eye ~ 

Bonus applied if less then 500 of the animal type is on the grid.

Each Eye is treated like a individual trait.

Rarity of 0 – 25% = 3
Rarity of 26 – 50% = 2
Rarity of 51 – 75% = 1
Rarity of 76 – & Up = 0

Ears ~ 

Types All Ears come in Little, Natural & Big

Curved, Cupped, Bent, Tweaked, Torn, Floppy, Pinched, Worn, Pointed, Chewed.

Bonus applied if less then 500 of the animal type is on the grid.

Each Ear is treated like an individual trait

Rarity of 0 – 25% = 3
Rarity of 26 – 50% = 2
Rarity of 51 – 75% = 1
Rarity of 76 – & Up = 0

Teeth ~

Natural 0

Fangs = 1

Prehistoric = 2

Broken Tooth = 3

Crooked Tooth = 4

Single Fang = 4

Sabertooth = 4

LongToothSNGLFang = 4

Baby = 5

Missing Tooth = 5

Missing Fang = 5

Missing Long = 5

Snaggle = 5

Tail ~ 

Short = 1

Natural = 0

Long = 2

Stubby = 3

Bent = 4

Lynx = 4

Bob = 4

Scale ~

Baby = 3

Runt = 2

Natural = 0

Mini = 1

Large = 3

XLarge = 4

Gentle Giant = 5

Extreme = 3

Whiskers ~

Natural = 0

Long = 1

Extra Long = 2

Super Long = 3

Short = 4

shortTall = 4

Wide = 4

Glow ~

Natural = 0

Moonlight = 1

Sunlight = 2

Shine ~

Natural = 0

Glisten = 1