White whales are not endangered yet but still they are threatened by pollution and habitat reduction.

白鲸没有濒临灭绝，但是他们的栖息地受到污染减少。

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Management of host Abundance Exclusion of hosts by fencing, host reduction, and host reduction by management of the host habitat.

宿主整治利用篱笆防止宿主进入，降低宿主数量，以及通过管理宿主栖息地减少宿主。

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Temperatures have been rising over the last century and a significant reduction of the permafrost is expected in the coming decades, threatening this unique natural habitat.

在上个世纪，气温一直持续上升，永久冻土在未来的10年里预计会大量减少，这一切都威胁着唯一的自然栖息地。

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Conservationists say that high levels of exploitation, loss of habitat and habitat degradation has led to the species experiencing a "significant population reduction" over the past 20-30 years.

BBC: Chester Zoo team on the hunt for new species in Nigeria