Proper cleaning and ventilation and measures to reduce crowding are also advised.

同时建议进行适当的清洁和通风，采取减少拥挤方面的措施。

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Predator will tend to aggregate in the most profitable patches, but predator crowding will reduce the patch profitability until it is better to another less crowded patch.

捕食者趋向于聚集在最有利可图的斑块中，直至移到另一块不太拥挤的斑块中去会更好。

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The spokesman added: ""We are aiming to reduce the existence of crowding alongside reducing the cost of the prison estate.

BBC: Shrewsbury Prison 'is second most overcrowded'