What's in the news this week?

What was unusual sight did Waikato residents see in the Piako river 10km inland? A Pod of dolphins

The pod of dolphins seen cruising kilometres up a Waikato river were likely following their stomachs.

The behaviour of the estimated 60 dolphins surprised the bystanders and scientists, who say their actions highlighted how much there was still to learn about the marine mammals.

On Monday, the dolphins - some around 2.5m long - made their way from the Firth of Thames up the Piako River and were spotted in Ngatea, an inland swim of 12km.

Niwa marine mammal scientist Dr Krista Hupman said telling by the shape of the dolphins' fins, they appeared to be either bottlenose or common dolphins, though both species swimming in an pod together is extremely rare.

I think this really interesting, and I wish I was there when it happened. This just proves that we don't know everything about every thing. There are still things we haven't discovered.