Excluding humans, more wackys contain birds than any other animal.  The animals on wackys break down as follows (this only includes die-cuts and 1-16, no wacky Ads or post 1977):
 
a more extensive list is currently under construction
 

animal	number of wackys containing this animal
human1	343
bird	27
fish	21
dog	16
insect/arachnid	13
primate	11
cat	10
horse/donkey/mule	8

 
or more specifically
 

human1	343
dog	16
bat	6
pig	6
worm	8
house cat	7
tiger	1
lion	2
rabbit	2
duck	7
chicken 2	9
canary	1
penguin	1
crow	1
rooster	1
bird (other) 3	7
fish (but not shark)	14
shark	3
bear	4
tick	1
ant	1
bee	1
cricket	1
lice	1
spider4	2
fly5	5
mosquito	1
flea	1
aligator	2
chimpanzee	2
ape	6
unidentified primate6	3
octopus/squid	4
camel	1
giraffe	1
seal	2
rat	1
mouse	2
horse	5
mule/donkey	3
cow	3
elephant	3
hippo	1
sheep	2
dinosaur	1
skunk	4
frog/toad	2
hyena	1
clam	2
beaver	1
unidentifiable vermin7	6
unhumanoid monster	5
unidentified animal8	1
animated plant/vegetable9	9
animated object10	12
no animal life form	49

 
 
1  includes human body part (hand, toe, etc,), witches, ghouls, mermaids, mummy's, devils, ghosts, or any otherwise humanoid monsters
2  includes chicken parts (leg, etc.)
3  Nestree, Cheep, Bird Brain, Pollydent, Bloodweiser, Dr. Nest, Jungle
4  Campy, Windhex
5  Stiffords, Botch, Blue Beanie, Hippy, Ain't
6  GI-Toe, Creature Crackers, Gulp
7  spray nit, lavirus, quake & ache, paid killers, national geografink, bug wally
8  Play Dumb
9  tomato, peanut, pinapple, corn, apple, flower, cough drop
10 hot dog, slim jim, light bulb, planet, cracker, spitoon, etc.    
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