NOUN
- the most primitive mammals comprising the only extant members of the subclass Prototheria
How To Use egg-laying mammal In A Sentence
- A team of scientists has discovered a lost world of rare plants, giant flowers and bizarre animals -- including a new species of honeyeater bird, a tree kangaroo and an egg-laying mammal -- on a mist-shrouded mountaintop in a remote province of Indonesia on New Guinea island. Science Project
