Great Black backed Gull

This is the largest gull, bigger than a Herring Gull. It is 71–79 cm (28–31 in) long with a 1.5–1.7 m (5–5.7 ft) wingspan and a body weight of 1.3–2.2 kg (2.9–4.8 lb), though large males regularly exceed this weight.

This behaviour can commonly be observed in urban areas and landfill sites where the gulls feed on Feral Pigeons, rats and mice. They frequently rob other seabirds of their catch and have been known to follow feeding Humpback Whales, Porbeagles and Northern Bluefin Tuna to catch fish driven to the surface by the larger animals. Great Black-backed Gulls are major predators at the nesting colonies of smaller seabirds, killing and eating eggs, chicks and adult birds. Atlantic Puffins, Common Murres, Herring Gulls, Common Terns, Roseate Terns, Manx Shearwaters, Horned Grebes and Laughing Gulls are regularly killed and eaten by the Great Black-backs.

Common Buzzard

The Common Buzzard (Buteo buteo) is a medium to large bird of prey, whose range covers most of Europe and extends into Asia. It is typically between 51–57 cm in length with a 110 to 150 cm (1 metre to a metre and half) (48–60 inch) wingspan, making it a medium-sized raptor. There are around 40,000 breeding pairs in Britain. It is usually resident all year, except in the coldest parts of its range, and in the case of one subspecies.

It breeds in woodlands, usually on the fringes, but favours hunting over open land. It eats mainly small mammals, and will come to carrion. A great opportunist, it adapts well to a varied diet of pheasant, rabbit, other small mammals to medium mammals, snakes and lizards, and can often be seen walking over recently ploughed fields looking for worms and insects. The birds have incredible strength and are therefore able to pick up food of all weights.

The Red Kite

The Red Kite:

The Red Kite is 60–66 cm (24-27 in) long with a 175–195 cm wingspan; males have a weight of 800–1200 g, and females 1000–1300 g. It is an elegant bird, soaring with long wings held at a dihedral, and long forked tail twisting as it changes direction. The body, upper tail and wing coverts are rufous. The white primary flight feathers contrast with the black wing tips and dark secondaries. Apart from the weight difference, the sexes are similar, but juveniles have a buff breast and belly. The call is a thin piping, similar to but less mewling than the Common Buzzard. There is also a rare white leucistic form which accounts for approximately 1% of hatchlings in the Welsh population but is at a disadvantage in the survival stakes.

The Red Kite's diet consists mainly of small mammals such as mice, voles, shrews, young hares and rabbits. It also feeds on a wide variety of carrion including sheep carcasses and dead game birds. Live birds are also taken and occasionally reptiles and amphibians. Earthworms also form an important part of the diet, especially in the spring.
As scavengers, red kites are particularly sensitive to poisoning. Illegal poison baits set for foxes or crows are indiscriminate and kill protected birds and other animals.
At signs of danger a mother will signal the young who will "play dead" to the extent that a fox will believe them to be dead and leave them, thinking it can return to eat them later.
Breeding
Adult red kites are sedentary birds, and they occupy their breeding home range all year in the United Kingdom, though many of the global populations are migratory (particularly the Swedish population, which winters in Spain). Each nesting territory can contain up to five alternative nest sites. Both birds build the nest on a main fork or a limb high in a tree, 12-20m high made of dead twigs and lined with grass or other vegetation and sheep’s wool.