Laura Tingle's Canberra, bird flu scare and Paul Salopek on his world trek

7:30's Chief Political Correspondent Laura Tingle unpacks Peter Dutton's Budget reply speech. Then, a new strain of bird flu is wreaking havoc across the world; what's the risk to Australia? And finally we re-join national Geographic Explorer Paul Salopek in Georgia, 12 years into his Out of Eden walk.