The huge eye of the world's largest squid has been revealed by scientists dissecting a rare, intact half-tonne specimen in New Zealand.
About 27cm (11in) across, researchers believe the colossal squid's eye is the biggest animal eye ever found.
The 10m-long (34ft) specimen has also turned out to be female, surprising the scientific team.
Very little is known about colossal squid; only about 10 have ever been caught and brought to shore.
This one was caught by fishermen in the Ross Sea near Antarctica last year.
Scientists hope the dissection will yield new information about where and how colossal squid (Mesonychoteuthis hamiltoni) live and breed.
Scientists examine the colossal squid in its saltwater bath (no sound)
"These are truly amazing eyes," commented Eric Warrant from the University of Lund in Sweden, an expert on animal vision who is at the Museum of New Zealand Te Papa in Wellington to take part in the dissection.
"In the collapsed state we see here, they measure 25cm across; but in the living animal they are probably larger, up to around 30 cm."
With a diameter larger than a football, these would help the fearsome hunters locate prey in the dark Southern Ocean depths. The pupils alone are about 8cm (3in) across
"These are without doubt the largest eyes that have ever been studied, and probably among the largest eyes that have existed during the history of the animal kingdom," Professor Warrant concluded.
Hooked on food
The 10-strong team of researchers had initially believed the colossal squid to be male.
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