Overthrone

“We need to take immediate action to protect the monarch so that it doesn’t become another tragic example of a widespread species being erased because we falsely assumed it was too common to become extinct.” (http://news.mongabay.com/2014/0908-morgan-monarch-esa.html)

The passenger pigeon [Past] was a dreadful president.
No, precedent.

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Quarry

European-funded habitat restoration has produced, for example, “sightings of the threatened small blue and grizzled skipper butterflies at restored Cemex quarry sites in Warwickshire” (http://www.rspb.org.uk/news/351602-new-project-aims-to-give-nature-a-home-in-quarries)

Sand in your pits would make anyone grizzly.