我儿子特别喜欢爬行动物，尤其是蜥蜴和蛇。

My son is very interested in ___reptiles, especially lizards and snakes.

那个政客是个冷血的爬虫，从不关心普通人的疾苦。

That politician is a cold-blooded ___reptile who never cares about ordinary people's struggles.