Although introduced by humans, the fallow deer has been here so long that it is considered naturalised. Look out for groups of white-spotted deer in woodland glades.

With club-shaped leaflets on its fronds, wall-rue is easy to spot as it grows out of crevices in walls. Plant it in your garden rockery to provide cover for insects.

Famed for its tapping in the middle of the night, supposedly heralding tragedy, the Deathwatch beetle is a serious wood-boring pest. In houses, their tunnelling can cause major damage.

In early spring, listen out for the 'chiff chaff chiff chaff' song of the appropriately named chiffchaff. It can be heard in woodland, scrub, parks and gardens across the UK.

In spring and summer, look out for 'cuckoo-spit' - the frothy mass of bubbles that appears on plant stems everywhere. This is actually the protective covering for the nymphs of the tiny…

The lesser spotted woodpecker is the smallest of the UK's woodpeckers. Listen out for its drumming, which is quieter than that of the great spotted woodpecker, in woodland, parks , orchards…

The striking black-and-white checks of the marbled white are unmistakeable. Watch out for it alighting on purple flowers, such as field scabious, on chalk and limestone grasslands and along…

A dark, stocky warbler, the Cetti's warbler is most likely to be heard, rather than seen - listen out for its bubbling song among willow, marsh and nettles.

A sure sign that spring has arrived, the Cuckooflower blooms from April. Look out for its delicate, pale pink flowers in damp meadows and ditches, and on riverbanks.