A Yosemite park official outlines the procedure that is being used to deal with the mice.
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Tottenham have reached an agreement with the Football Association to play their European fixtures at Wembley next season.
The creatures feed on cherry trees, hawthorn and blackthorn and built the web to protect themselves from predators.
The presumptive Republican nominee was speaking to a crowd in San Diego's convention centre, whilst 1,000 people demonstrated outside.