By Jano Gibson, for ABC News
Photo: ABC/Jano Gibson
At Berkley Island in East Antarctica, hordes of AdΓ©lie penguins are nesting on a rocky outcrop surrounded by broken sea ice.
As they waddle and squabble among themselves, Weddell seals slumber nearby, while a lone skua soars in the sky above.
It's a classic Antarctic scene, replicated across the continent's coastline.
But scientists are concerned about a threat looming on the horizon - the deadly H5 strain of bird flu.
"We know that this is a really contagious virus that can spread, but it can be absolutely d
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