Research by the RSPB has revealed that robins in London thrive better than anywhere else in the country. Between 1995 and 2010, the charity believes the numbers of the robins rose by 76%.
However, they warn that robins are susceptible to very cold weather so the numbers may have declined since then because of the cold winters.
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British Transport Police confirmed the trio have been charged with obstructing trains or carriages on the railway by an unlawful act.
The white hedgehogs were found huddled up in a cardboard box with newspaper and a fleece.
The demonstration, dubbed #OperationShutdown, saw supporters initially gather near Downing Street.