5 sentences

1. 海豚属于哺乳动物。

   hǎi​tún shǔ​yú bǔ​rǔ dòng​wù.

   Dolphins are mammals.

   Source: Dong Chinese Dictionary

2. 鸟类和哺乳动物一样，都是热血的。

   niǎo​lèi hé bǔ​rǔ​dòng​wù yī​yàng, dōu shì rè​xuè de.

   Birds, like mammals, are warm-blooded.

   Source: Dong Chinese Dictionary

3. 那些嗷嗷待哺的孤儿需要社会的关注。

   nà​xiē áo áo dài​bǔ de gū'ér xū​yào shè​huì de guān​zhù.

   Those orphans crying for food need the attention of society.

   Source: Dong Chinese Dictionary

4. 澳大利亚超过90%的哺乳动物是夜行动物。

   ào​dà​lì​yà chāo​guò90% de bǔ​rǔ​dòng​wù shì yè​xíng​dòng​wù.

   More than 90% of Australia's mammals are nocturnal.

   Source: OpenSubtitles

5. 鲸鱼虽然生活在海洋中，但它们是哺乳动物。

   jīng​yú suī​rán shēng​huó zài hǎi​yáng zhōng, dàn tā​men shì bǔ​rǔ​dòng​wù.

   Although whales live in the ocean, they are mammals.

   Source: Dong Chinese Dictionary