Hermit crab
If you spot a crawling shell next time you're at the seaside, take a closer look… it might be a hermit crab!
Herring gull
The herring gull is the typical 'seagull' of our seaside resorts, though our coastal populations have declined in recent decades.
High brown fritillary
Considered Britain's most threatened butterfly, the high brown fritillary can be only be found in a few areas of England and Wales.
Himalayan balsam
As its name suggests, Himalayan balsam is from the Himalayas and was introduced here in 1839. It now an invasive weed of riverbanks and ditches, where it prevents native species from growing.
Hobby
Look out for the swift-like shape of the hobby as it darts over heathlands and wetlands in summer. They are keen hunters, chasing and catching fast-flying dragonflies and small birds on the wing.
Hogweed
Hogweed can be found along hedgerows and roadside verges, and on waste ground and rough grassland. It displays umbrella-like clusters of creamy-white flowers. It's native, unlike its relative, Giant Hogweed.
Holly
Holly is a much-loved evergreen tree - its shiny, spiky leaves and bright red berries being a favourite in Christmas decorations. Found in all kinds of habitats, it provides an important winter food source for birds.
Holly blue
Look out for the small Holly Blue in your garden or local park. It is the first blue butterfly to emerge in spring, and a second generation appears in summer. The caterpillars are fond of holly and ivy.
Holm oak
The Holm oak is an introduced species that has been widely planted near the coast and in parkland. It is self-seeding in the south of the UK. Its young leaves are spiny like Holly leaves, and it produces acorns.
Honesty
The papery, translucent, silver 'coins' of Honesty are instantly recognisable. They are actually the leftover seed pods that dangle from the plant through winter.
Honey bee
Honeybees are famous for the honey they produce! These easily recognisable little bees are hard workers, living in large hives made of wax honeycombs.
Honey buzzard
Rare summer visitors, honey buzzards breed in open woodland where they feed on the nests and larvae of bees and wasps.