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These "hitchhiking intruders" have included a tree frog that emerged from roses at a florist's shop in Sheffield and snakes discovered in ornamental olive trees shipped across mainland Europe.

The centre has seen everything from a European tree frog in a home furnishings store, to a venomous spider in a case of Australian wine.

In spring, find western bluebirds, great horned owls and tree frogs, chipmunks, buttercups, warblers and three species of hummingbirds.

The number doesn’t include small mammals and low-mobility species often missed by cameras, like the northern flying squirrel, Pacific tree frog, banana slug and coastal giant salamander.

In 2021, the year for which figures are available: four White’s tree frogs, one African dwarf frog and one Pacific tree frog.