The caterpillars are a rare visitor from southern England and have no natural predator.
BBC: Natural invasion causes health problems
The red-veined darter is a rare visitor from southern Europe and was spotted at Brecknock Wildlife Trust's Brechfa Pool nature reserve above Llyswen.
BBC: Rare dragonfly visitor at reserve
Among the exhibits at Crossrail's visitor information centre in St Giles High Street are medieval human bones found at Liverpool Street, a rare amber find and a piece of mammoth jaw bone.
BBC: Bronze Age transport route 'found during Crossrail dig'
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