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The bee-eaters are a group of near-passerinebirds in the familyMeropidae. They are characterised by richly coloured plumage, slender bodies, and usually elongated central tail feathers. All have long downturned bills and pointed wings, which give them a swallow-like appearance when seen from afar. There are 26 different species of bee-eaters.

As the name suggests, bee-eaters predominantly eat flying insects, especially bees and wasps, which are caught in the air by sallies from an open perch.While they will pursue any type of flying insect, honey bees predominate in their diet.

Before eating its meal, a bee-eater removes the sting by repeatedly hitting and rubbing the insect on a hard surface. During this process, pressure is applied to the insect thereby extracting most of the venom. Notably, the birds only catch prey that are on the wing and will ignore flying insects once they land.

Bee-eaters are gregarious. They form colonies by nesting in burrows tunnelled into the side of sandy banks, such as those which have collapsed on the edges of rivers. Their eggs are white and they generally produce 2-9 eggs per clutch (depending on species), which are widely distributed and common. As they live in colonies, large numbers of these holes are often seen together, white streaks from their accumulated droppings accentuating the entrances to the nests. Most of the species in the family are monogamous, and both parents care for the young, sometimes with the assistance of other birds in the colony.

The bee-eaters are a fairly uniform group, morphologically. They share many features with related Coraciiformes such as the kingfishers and rollers, being large-headed (but not as large-headed as their relatives) short-necked, brightly plumaged and short-legged. Their wings may be rounded or pointed, with wing shape closely correlated with foraging habitat and migratory tendencies. Shorter, rounder wings are found on species that are sedentary and make shorter foraging flights in denser forests and reedbeds. Those with more elongated wings are more migratory. All the bee-eaters are highly aerial. They take off strongly from perches, fly directly without undulating, and are able to change directions quickly. Bee-eaters rarely hover, however.

The bills of bee-eaters are curved, long and end in a sharp point. The bill can bite strongly, particularly at the tip, and is used as a pair of forceps with which to snatch insects from the air and crush smaller ones. The short legs have weak feet, when moving on the ground its gait is barely more than a shuffle. The feet have sharp claws used for perching on vertical surfaces and also during nest excavation.

The plumage of the family is generally very bright and in most species dominated or at least partly green.

There is little visible difference between the sexes in most of the family. In several species the iris is red in the males and brown-red in the females, and in species with tail-streamers these may be slightly longer in males. Both the European and Red-bearded Bee-eaters have differences in the colour of their plumage, and the Rainbow Bee-eaters have differently shaped tail-streamers. There are however probably undocumented instances where bee-eaters are sexually dichromatic in the ultraviolet end of the colour spectrum, which humans cannot see.

The bee-eaters have an Old World distribution, occurring from Europe to AustraliaA single species occurs in Europe, the European Bee-eater.

Bee-eaters are fairly catholic in their habitat. Their requirements are a simply an elevated perch from which to watch for prey and a ground substrate in which to dig their breeding burrow. Because their prey is entirely caught on the wing they are not dependent on any vegetation type.

A number of the bee-eaters are migratory. Species that breed in subtropical or temperate areas of Europe, Asia and Australia are all migrants. The European Bee-eaters that breed in southern Europe and Asia migrate to west and south Africa.

The bee-eaters are diurnal (active by day) although a few species may migrate during the night if the terrain on route is unsuitable for stopping or if they are crossing the sea. They are a highly social family. Pairs sitting together will often be so close together that they are touching (described as having an individual distance of zero). Groups may roost together in a row in such a fashion as well. Some species are highly gregarious in the non-breeding season, and many species are colonial in the breeding season as well.

Bee-eaters spend around 10% of their day on what are known as comfort activities. These include sunning themselves, dust bathing and water bathing. Sunning behaviour helps warm birds in the morning, reducing the need to use energy to raise the temperature. It also has a social aspect, as multiple birds will adopt the same posture together. Finally, it may help stimulate parasites in the feathers, making them easier to find and remove. Due to their hole-nesting bee-eaters accumulate a number of ectoparasites such as mites and flies. Together with sunning bouts of dust bathing (or water bathing where available), as well as rigorous preening, keep the feathers and skin in good health. Bathing with water involves making shallow dives into a water body and then returning to a perch to preen.

The bee-eaters are almost exclusively aerial hunters of insect prey. Prey is caught either while in continuous flight or more commonly from an exposed perch where the bee-eater watches for prey. Smaller, rounder-winged bee-eaters typically hunt from branches and twigs closer to the ground, whereas the larger species hunt from tree tops or telegraph wires. One unusual technique often used by carmine bee-eaters is to ride the back of bustards. Prey can be spotted from a distance; European Bee-eaters are able to spot a bee 60 m away, and Blue-cheeked Bee-eaters have been observed flying out 100 m to catch large wasps. Prey is approached directly or from behind. Prey that lands on the ground or on plants is usually not pursued. Small prey may be eaten on the wing, but larger prey are returned to the perch to be beaten against the perch to kill them and break them up. Insects with poisonous stings are first smacked on the branch, then, with the eyes closed, rubbed to discharge the venom. This behaviour is innate, as demonstrated by a juvenile bird in captivity which performed the task when first presented with wild bees. This bird was stung on the first five tries, but by ten bees, it was as adept at handling bees as adult birds.

Bee-eaters consume a wide range of insects; beyond a few distasteful butterflies they consume almost any insect from tiny flies to large beetles and dragonflies. At some point bee-eaters have been recorded eating beetles, mayflies, stoneflies, cicadas, termites, crickets and grasshoppers, mantises, true flies and moths. For many species the dominant prey item are stinging members of the order Hymenoptera, namely wasps and bees. In a survey of 20 studies the proportion of the diet made up by bees and wasps varied from 20% to 96%, with the average being 70%. Of these honeybees can comprise a large part of the diet - as much as 89% of the overall diet.

Bee-eaters are seasonally monogamous, and some species are monogamous over multiple seasons. Migratory species however are thought to form new pair bonds each breeding season. Most members of the family engage in courtship feeding, where the male presents prey items to the female, and such feeding can account for much if not all of the energy females require for egg creation.

Like almost all Coraciiformes the bee-eaters are cavity nesters. In the case of the bee-eaters the nests are burrows dug into the ground, either into the sides of earth cliffs or directly into level ground. Both types of nesting site are vulnerable, those on level ground are vulnerable to trampling and small predators, whereas those in cliffs, which are often the banks of rivers, are vulnerable to flash floods which may wipe out dozens or hundreds of nests.  The burrows are dug by both birds in the pair as well as any helpers that have joined the pair. The soil or sand is loosened with jabs of the sharp bill, then the feet are used to kick out the loose substrate. There may be several false starts where nests are dug partway before being abandoned; in solitary species this can give the impression of colonial living even when they are not. The process of nest building can take as long as twenty days to complete, during which the bill can be both blunted and shortened. Nests are generally used only for a single season and are rarely used twice by the bee-eaters, but abandoned bee-eater nests may be used by a host of birds, snakes and bats as shelter and breeding places.

Bee-eaters may nest as single pairs, loose colonies or dense colonies. Smaller species tend to nest solitarily, while medium sized species do so in the smaller colonies and larger and migratory species nest in large colonies that can number in the thousands. In some instances colonies may contain more than one species of bee-eater.