Illustrated Earth Language Dictionary - Mammals (哺乳動物) -

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Classification of lives (生物分類)

It is the combination of ( animal: { move, life/living thing} and }. In this case, is not for the meaning of recognition, but symbolizing mammal's breast by its shape.
* Mammals have many characteristics, but nursing with mother's milk is the best for recalling the image.
Scientifically, it means : Class Mammalia.
Most mammals are expressed by a compounded character of and its characteristics.
The most mammal symbols here in the pictures are Genus/Family names scientifically.  
To show a species name, put the Genus name in and its characteristic ideogram next.
For more about the classification way and the way to express a mammal name
with plural easy characters and or , see here.

: 乳房を象徴する２点 を加えた｢動物｣｛ 動く、 命｝の文字で、 哺乳動物を示します。
哺乳動物には多くの特徴があっても授乳で育つことが最もイメージしやすいところからの組み合わせです。
生物分類の 哺乳綱に当たります。
ここの絵では種名ではなく主な属名を上げています。
詳しい種名は、 属名を に入れ、その右に特徴を示す記号を並べて表現します。
ほとんどの哺乳類は の上にイメージしやすい固有の特徴を重ねて示しますが、
重ねて複雑になる場合には、文字の中身を左右にわけて でつないでも同じです。
以下の動物のなかには、ネコのように科と属の両方を表すものもあります。

Order Carnivora (食肉目)

Sub-order Caniformia (in this group, dog family is familiar to the people worldwide) (イヌ亜目)
or { (mammal), (home)}: dog (犬)

* It's usually related to human's home in history,  so  it could help to imagine this mammal.
( Carnivora (Order: Carnival), Caniformia (Sub-order: dog), Canidae, )

or (wildness): coyote (*They are just related to dog-image, but not to home )(コヨーテ)
or (violent wildness): wolf (狼)
or (small): fox (狐)
or (wild) (large)}: bear (熊)
(long): weasel (イタチ)
(hands: they look like using their hands): raccoon (ラクーン)
(nasty odor/臭い): skunk (スカンク)

Sub-order Feliformia (in this group, cat family is familiar to the people worldwide)  (ネコ亜目)
or (nail/claw): Genus Felis, cat (ネコ科/猫)

* Mammals usually have nails/claws, but cat's group have more remarkable claws to catch their game.
Their predatory teeth are also a biological feature, but "teeth" symbol is used for rat kinds, since they gnaw most of time.
(ネコ属は食肉用の歯が特徴的ですが、常にかじっている歯のネズミの種類の記号に｢歯｣を用い、
ネコ科のシンボルは獲物をつかまえる鋭い爪を用いることにしました。)

or (wild): wild-cat/mountain-cat (山猫)
or large}: Genus Panthera {puma, cougar, mountain lion, panther (豹)
or ({power, large} strong) (the strongest mammal): Lion (ライオン)
(large and one/alone): tiger (虎)
(swift/fast) (the fastest runner): cheetah (チータ)

Order Artiodactyla (mammal group having even number hooves; cattle and deer type of group)(偶蹄目)
or (from milk): Family Bovidae/ cattle, generic term of any kinds of cattle {cow, ox, bull} (ウシ科、牛)

* All mammals raise a baby with milk, but milk of cow is the most common among us humans; so this symbol was made. Also the symbol looks like a cow face a little, don't you think so?
(どの哺乳類も哺乳で育てますが、人間には動物の中で牛のミルクが最も使われるので、
ミルクと似た文字をウシに当てました。ウシの顔にも似ていませんか？)

female cattle: cow (牝牛)
male cattle: bull (牡牛)
child cattle: calf (子牛)
cattle group: a herd of cattle (牛の群れ)
{large wild cattle}: buffalo/bison (バッファロー)
(horn): Caribou (トナカイ)
(horn-large): moose (ヘラジカ)

or (horn) (having great horns): antelope (レイヨウ)
(hair: because of wool image): sheep (羊)
or (branch): deer/Cervidae (deer Family) (鹿/シカ科の動物)
or (large): elk/Cervus canadensi（エルク）

or (neck): Giraffidae/giraff (キリン)
 
or (meat) (Doesn't it look like a pig seen from the front?): pig/Suidae (豚･イノシシ科の動物)
or wild/nature: boar (猪)
small: pecarry/Family Tayassuidae (ペッカリー) 
* means small boar. (つなぎ記号をはずすと小さな猪の意味になるので要注意)
(large): Hippopotomas/Family Hippopotamidae (カバ)

{ {(support with legs) and (swelled, hump)}: camel/Family Camelidae (ラクダ)

* Camelidae is closer to cattle included in the same Order Artiodactyla;
but since humans have used them for a ride and carrying things similarly to horses,
the similar looking symbols to horse was prepared for the camel  family.
(ラクダはウシに近い仲間ですが、ヒトにとっての脚となりウマに似た働きをしてきました。
そこで記号でもウマのほうに似ながら、瘤を加えています。)

(mountain): llama (ラマ)

or (legs/support): horse/Family Equidae(馬/)
(fast): race-horse (競走馬)
(small): donkey (ロバ)
(work): mule (ミュール)

or (ear) (with remarkable ears): Leporidae/rabbit (ウサギ科、ウサギ)
: hare (ノウサギ)
or (teeth) (gnawing with always growing teeth}: Rodentia/rat (げっ歯目・ネズミ類)
(small): mouse/mice
or (tail): Sciurida/squirrel; chipmunk (with ) (リス科、リス)

or (nose)-(large): Proboscidea/elephant (長鼻目･象)

or { mammalia, (egg)}(mammals born from an egg): Monotremata/Platypus (単孔目/カモノハシ)
(Monotremata with needles): Echidna

or (container/sack): Marsupialia (有袋目)
(large): Kangaroo (カンガルー)
or  (small): Wallaby (ワラビー)
or (tree): Phascolarctidae/Koala (コアラ)
(nose; its nose is remarkable): Didelphidae/Opossum (フクロネズミ)
or (wings): Chiroptera/bat (コウモリ目、コウモリ)
(hole): Talpidae/ mole (モグラ科、モグラ)
or (needle): Erinaceidae/ hedgehog (ハリネズミ)

Mammals in Water
(* This is not a biologically classified group; but these symbols are set according to the place where they mainly live, for imagining easiness)

or (ocean): Cetacea/dolphin (クジラ目、イルカ)
or : whale (鯨)
: killer-whale

or (edge of the sea): Pinnipedia/Otariidae (アシカ亜目、アシカ科)
(vertical) (they can stand their front body): Otariidae/ eared seals {sea lion, fur seal}(アシカ)
(horizontal) (always horizontally longer, lying on the land): Phocidae/earless seals/true seals (アザラシ科、アザラシ)
(fang/tusk): Odobenidae/Walrus (セイウチ科、セイウチ)
or (wave)(floating on the wave): Lutrinae/Enhydra/sea-otter (カワウソ亜科、ラッコ)
(land)(they move around on the land, too): river otter (カワウソ)