Are platypuses mammals or oviparous?
Platypuses are both mammals (as they raise their off-springs with maternal milk) and oviparous (as they lay eggs).
### Instruction: Are platypuses mammals or oviparous?
### Context: 
### Answer: Platypuses are both mammals (as they raise their off-springs with maternal milk) and oviparous (as they lay eggs).</s>