Markus and Mo weighed about 70kg (11st) at birth, and now weigh about 500kg (78st) each.
The popular attraction in County Down has been forced to close while efforts continue to remove oil from the pond.
Two men from the Armagh Planetarium and Observatory have had asteroids named in their honour in recognition of their work.
With both sides to face over the next 12 months, what can England take from South Africa and Australia's enthralling Test series?
The Herts and Middlesex Trust says it is "thrilled" the new wetlands are helping species thrive.
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