This month, a campaign was launched to re-introduce the short-haired bumblebee to the UK from New Zealand.
This species, Bombus subterraneus, was last recorded in the UK in 1988. Luckily a small number of British bees were transported to New Zealand in the late 19th century to pollinate crops of red clover.
The short-haired bumblebee project is set up by Natural England, the Bumblebee Conservation Trust (BBCT), RSPB and Hymettus. It hopes to restore suitable bumblebee habitat in England, with the help of farmers, to bring back the British bees and protect them in the future.
Some bumblebees are under threat worldwide and some UK species are declining in numbers. This seems to be due to habitat loss and loss of certain flower species such as the red clover.
The UK has around 20 bumblebee species and there are about 250 bumblebee species worldwide. However, there are about 20,000 different bees around the world and this includes bumblebees, honeybees and solitary bees.
Many bees are extremely important for pollinating commercial crops such as cucumbers, tomatoes, strawberries and coffee. Bees account for 85% of the value of all insect pollinated crop plants in Europe.
It may be surprising to know that 8 of the 20 British species have been seen buzzing around in the heart of London in the Natural History Museum's Wildlife Garden.
The garden habitat is a haven for the insects and attracts all of the 6 common bumblebee species (the common carder, red-tailed, early-nesting, white-tailed, buff-tailed and garden) as well as the less common tree bumblebee, southern cuckoo bumblebee, and four-coloured cuckoo bumblebee.
The tree bumblebee, Bombus hypnorum, was a surprise arrival into the Museum garden in 2006. Colonising southern England only recently, probably from France, it has reached Yorkshire after only 8 years.
It has a gingery front and black tail with a contrasting white tip. The males regularly visit plants such as the greater willow herb, purple loosestrife, teasel and buddleja. Tree holes and sometimes bird boxes are favourite nesting sites.
A number of other insects in the Wildlife Garden look like bumblebees, such as chunky black and brown flower bees Anthophora spp., which can be seen darting from flower to flower. They are easy to spot because they fly much faster than the leisurely bumblebees.
A number of hoverflies are bee mimics, such as Eristalis intricarius. Their black, yellow and white stripes earn them some protection from predators.
Bumblebees need flowers for nectar and pollen during the spring and summer. Excellent food sources are native wildflowers, such as knapweed and clovers. Flowering herbs such as sage and chives are easy to grow in even the smallest window box.
Bumblebee species differ in their preferences, so it's a good idea to provide a range of different flowers, if possible. Highly cultivated garden flowers or double flowers are not as good for bees because they produce little pollen or nectar.
To encourage bumblebees to nest, leave an untidy, undisturbed corner in your garden.
Remember if you are growing vegetables in your garden, many require bumblebees to pollinate them. 'I like to encourage bumblebees because they pollinate my runner beans,' says David Notton, insect expert at the Museum. 'Bumblebees are an attractive and useful addition to any garden.'