 Birds that can be seen include the kaka, kea, yellow-crowned parakeet, South Island robin, fantail, bellbird, grey warbler and South Island tomtit.Hector's dolphins are often seen around Port Craig and occasionally people are able to swim with them.The track crosses three big viaducts — the largest, the Percy Burn is thought to be one of the biggest wooden viaducts in the Southern Hemisphere and is referenced in Warren Bird's book "Viaducts Against the Sky".