The zoo’s male, Kuzma, who was born at Banham in 2008, was recently ranked as one of the most important males within the breeding programme.
His genes are poorly represented within the captive population so breeding him was considered a high priority. His mate, Sveta, arrived from Lisbon Zoo, Portugal in 2011 and this is their first successful litter together.
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It will be a dry day and very warm with bright and sunny spells.
Armed officers will be on patrol at major infrastructure sites across Essex and the county will see more police patrols.