There are a lot of idioms and sayings that use animals to convey their meaning.
There are a lot of idioms and expressions with animals in them.
ーThere are a lot of idioms and sayings that use animals to convey their meaning.
「意味を表すために動物を使ったことわざや慣用句がたくさんある」
idioms で「慣用句」
saying で「ことわざ」
to convey one's meaning で「意味を伝える・表す」
ーThere are a lot of idioms and expressions with animals in them.
「動物を使った慣用句や言い回しがたくさんある」
expression で「言い回し」
このように言った方がより自然です。
ご参考まで！
カナダ 
