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The names for these speculative particles often tack on an S to the names of known particles: selectrons contrast electrons, the squark is the inverted twin of the quark, and so on.

However, he said the park tried its best to reduce noise for neighbours, and he hoped the sign would discourage riders from "shouting excessively", even if some would inevitably "squark".

The quark, the building block of an atom’s protons and neutrons, would have a partner called the squark.

In 2007, its call was recorded for the first time, its song resembling something of an awkward “double squark”.

In 2007, its call was recorded for the first time, its song resembling something of an awkward “double squark”.