What's an adjective for "pertaining to donkeys"?
asinine : of, relating to, or resembling an ass
(also extremely or utterly foolish), M-W.
In perspective:
aquiline - eagle
asinine - donkey
bovine - cattle
cancrine - crab
canine - dog
cervine - deer
corvine - crow
equine - horse
elapine - snake
elaphine - red deer
feline - cat
hircine - goat
leonine - lion
leporine - rabbit, hare
lupine - wolf
murine - rodent
pavonine - peacock
piscine - fish
porcine - pig
rusine - deer
serpentine - snake
ursine - bear
vulpine - fox
(source (edited): input by beatlesfanatic123456 to this post)
As other answers have pointed out, asinine is an adjective relating to donkeys. In addition, donkeys are also equine. Equine means relating to the horse family, which happens to include donkeys as well as asses and zebras.
The small contribution of this answer here is to provide a list of animals and corresponding animal adjectives with the -ine suffix. This has been partially gleaned from this page at tinyonline.co.uk. It's alphabetical, so you'll need to scroll to the animal you're interested in:
A
ant formicine, myrmecine
anteater myrmecophagine
antelope antilopine
armadillo tolypeutine
ass asinine
B
badger meline, musteline
barracuda percesocine
basilisk lizard basilicine
bat noctilionine, pteropine
bear ursine
bird avine, volucrine
bird of prey accipitrine
bison bisontine
bull taurine
butterfly pieridine, pierine
buzzard cathartine, pyrrhuloxine
C
calf vituline
camel cameline
carp cyprine
cat feline
chicken galline
coral coralline
cormorant phalacrocoracine
cow bovine vaccine
crab cancrine
crocodile crocodiline
crow corvine
cuckoo cuculine
D
deer cervine
dodo didine
dog canine
dolphin delphine
domestic fowl galline
dormouse myoxine
dove columbine
dragon draconine
E
eagle aquiline
earthworm lumbricine
elephant elephantine
ermine musteline
F
fish piscine
flea pulicine
fox vulpine
frog ranine
fur seal otarine
G
gerbil cricetine
giant ground sloth megatherine
gibbon hylobatine
giraffe giraffine
H
hamster cricetine
hare leporine
hawk accipitrine, falconine
hippopotamus hippopotamine
horse caballine, equine
human hominine
hummingbird trochilidine, trochiline
humpback whale megapterine
I
ibis ibidine
J
jay garruline
K
kangaroo macropine, macropodine
kea nestorine
kingfisher dacelonine, halcyonine
kite milvine
L
lemming microtine
lemur lemurine
leopard pardine
limpet patelline
lion leonine
lizard lacertine
lobster homarine
louse pediculine
lynx lyncine
M
macaw psittacine
mamba elapine
manatee manatine
mite acarine
mockingbird mimine
mole talpine
mongoose herpestine, viverrine
moose cervine
mosquito aedine, anopheline, culicine
mouse murine, musine
musk ox ovibovine
N
nuthatch sittine
O
octopus octopine
opposum didelphine
oriole icterine
ostrich struthionine
otter lutrine, musteline
owl strigine
ox bovine, taurine
oyster ostracine
P
panther pantherine
parrot psittacine
partridge perdicine
peacock pavonine
perch percine
pheasant phasianine
pig porcine, suilline
pigeon pullastrine
polecat musteline
porcupine hystricine
porpoise phocaenine
python pythonine
Q
quail coturnine
R
rabbit leporine
rat murine
rattlesnake crotaline
rhinoceros ceratorhine, rhinerocerine
robin turdine
rodent glirine
S
salamander salamandrine
sea horse hippocampine
sea lion otarine
seal phocine
serpent serpentine
sheep ovine
shrew soricine
silkworm bombycine
skunk mephitine, musteline
skylark alaudine
snake anguilline, anguine, colubrine, serpentine, viperine
sparrow emberizine, passerine
sphinx sphingine, sphinxine
squirrel sciurine
starling sturnine
swan cygnine
T
termite termitine
tick acarine
tiger tigrine
titmouse parine, penduline
toad bufotenine
tortoise testudine
turkey meleagrine
V
viper viperine
vole microtine
vulture cathartine, vulturine
W
walrus odobenine
wasp vespine
weasel musteline
wolf lupine
wren troglodytine
Z
zebra equine hippotigrine, zebrine
If you want to see a lot of other lists which have snaffled lots of info from various dictionaries, you could try any of these:
http://www.dnafrequencies.com/dp/terms.shtml
http://www.davekoelle.com/animal_terms.html
https://elisabethaskin.wordpress.com/2011/08/10/27/
http://www273.pair.com/med/words/animal_adjectives.htm
http://www.dnafrequencies.com/dp/terms.shtml