European bee-eater

Taxonomy and systematics

The European bee-eater was formally described by the Swedish naturalist Carl Linnaeus in 1758 in the tenth edition of his Systema Naturae under its current binomial name Merops apiaster. The genus name Merops is Ancient Greek for "bee-eater", and apiaster is Latin, also meaning "bee-eater", from apis, "bee".

Description

This species, like other bee-eaters, is a richly coloured, slender bird. It has brown and yellow upper parts, whilst the wings are green and the beak is black. It can reach a length of 27–29 cm (10.6–11.4 in), including the two elongated central tail feathers. Sexes are alike. Female tends to have greener rather than gold feathers on shoulders. Non-breeding plumage is much duller and with a blue-green back and no elongated central tail feathers. Juvenile resembles a non-breeding adult, but with less variation in the feather colours. Adults begin to moult in June or July and complete the process by August or September. There is a further moult into breeding plumage in winter in Africa.

Breeding

These bee-eaters are gregarious—nesting colonially in sandy banks, preferably near river shores, usually at the beginning of May. They make a relatively long tunnel, in which they lay five to eight spherical white eggs around the beginning of June. Both male and female care for the eggs, which they brood for about three weeks. They also feed and roost communally.

During courtship, the male feeds large items to the female while eating the small ones himself. Most males are monogamous, but occasional bigamy has been encountered. Their typical call is a distinctive, mellow, liquid and burry prreee or prruup.

Reported UK breeding attempts

European bee-eaters have attempted to nest in Britain on at least 5 occasions:

• In 1920, a pair tried to nest in a sand bank of the River Esk at Musselburgh, Scotland. A local gardener captured the female and kept her in a greenhouse. She died two days later, after laying a single egg.
• In 1955, three pairs of bee-eaters nested in Streat sand quarry near Plumpton, East Sussex. The birds were first found on 12 June, though the birds' presence only became widely known at the start of August. One nest was accidentally destroyed by machinery in July, but seven young fledged from the two remaining nests towards the end of August. The RSPB instigated a wardening operation, and over 1,000 people visited the site. The birds remained until 24 September.
• A pair nested at Bishop Middleham Quarry, County Durham in 2002. The birds were first found on 2 June, and within a few days started to undertake courtship feeding and copulation. Five chicks hatched, but one died in the nest, one died before fledging, and a third disappeared and probably died. Durham Wildlife Trust (with RSPB assistance) set up a wardening post when the birds were nesting. They released news to rare bird information services, and the national news media also reported on the birds' presence. Around 15,000 people visited the site during their stay. The adults and both fledged young left on 28 August, flying off high to the south.
• A pair took up residence on farmland adjacent to the River Wye, near Hampton Bishop, Herefordshire in summer 2005. By mid-July, the adults began bringing insect food to the riverbank nest-hole, confirming that eggs had hatched. The RSPB began a wardening operation with public access. Around 2,000 people came to see the birds. However, on the evening of 29 July, foxes predated the nest, and the birds soon left.
• A pair excavated a nest hole at a coastal site in Dorset in 2006, but failed.
• in 2014, two pairs nested in the Isle of Wight, one nest fledged 3 chicks, the other 5. One nest had earlier been discovered and protected but the other was not found until late August.
• in 2015, two breeding pairs were found at a quarry in Cumbria.
• in 2017 seven nested at CEMEX quarry East Leake, Nottinghamshire, attracting thousands of bird-watchers.

Feeding

This bird breeds in open country in warmer climates. As the name suggests, bee-eaters predominantly eat insects, especially bees, wasps, and hornets. They catch insects in flight, in sorties from an open perch. Before eating a bee, the European bee-eater removes the sting by repeatedly hitting the insect on a hard surface. It can eat around 250 bees a day.

The most important prey item in their diet is Hymenoptera, mostly Apis mellifera. A study in Spain found that these comprise 69.4% to 82% of the European bee-eaters' diet. Their impact on bee populations, however, is small. They eat less than 1% of the worker bees in areas where they live.

A study found that European bee-eaters "convert food to body weight more efficiently if they are fed a mixture of bees and dragonflies than if they eat only bees or only dragonflies."

Predation of honey bees

If an apiary is set up close to a bee-eater colony, a larger number of honey bees are eaten because they are more abundant. However, studies show the bee-eaters do not intentionally fly into the apiary, rather they feed on the insects caught on pastures and meadows within a radius of 12 km (7.5 mi) from the colony, this maximum distance being reached only when there is a lack of food. Observations show that the birds actually enter the apiary only in cold and rainy periods, when the bees do not leave the hive and other insect prey are harder for the bee-eaters to detect.

Many bee-keepers believe that the bee-eaters are the main obstacle causing worker bees not to forage, and instead stay inside the hives for much of the day between May and the end of August. However, a study carried out in eucalyptus forest in the Alalous region, 80 km (50 mi) east of Tripoli Libya, showed that the bee-eaters were not the main obstacle of bee foraging, which is the opposite of what beekeepers think. The foraging rate was higher in presence of the birds than in their absence in some cases. The average bird meal consisted of 90.8 % honey bees and 9.2 % beetles.

Predation is more likely when the bees are queening or during peak migrations, from late March till mid-April, and in mid-September. Hives close to or under trees or overhead cables are also at increased risk as the birds pounce on flying insects from these perches.