'Echidnapus': Australian scientists discover ancient monotreme - BBC
- 'Echidnapus': Australian scientists discover ancient monotreme BBC
- Fossil trove reveals three new species of ancient egg-laying mammals New Scientist
- 'Echidnapus' fossil of potential echidna and platypus ancestor may point to Australian 'age of monotremes' ABC News
- 'Echidnapus': Australian scientists discover ancient monotreme BBC.com