Common pigeon

Wild rock doves/common pigeon nest in crevices along rocky seaside cliffs, close to agriculture or open shrub vegetation. Feral pigeons live in old farm buildings in rural areas. In cities, the skyscrapers tend to take the place of their natural cliff surroundings. The rock dove/common pigeon has a dark bluish-gray head, neck, and chest with glossy yellowish, greenish, and reddish-purple iridescence along its neck and wing feathers. Females tend to show less iridescence than the males. The bill is dark grayish-pink. Two dark bands across the wings are seen in most pigeons, and one bluish-gray band across the tail. Rock doves and feral pigeons can be divided into a large number of different phenotypes, or groups based on outward characteristics. Some of these classifications are the blue-bar, blue checker, dark checker, spread, and red phenotypes. Pigeons generally walk or run while bobbing their heads forward and backward. They fly with a steady and direct path. Pigeons are most often seen during daylight, seeking cover at night and in during the heat of the day, according to the climate. They flock while roosting, sunning, and feeding, but no play has been observed. In the nesting territory, both sexes are aggressive, pecking intruders on the head.

Sparrow

The house sparrow on the other hand is strongly associated with human habitations, and can live in urban or rural settings. Though found in widely varied habitats and climates, it typically avoids extensive woodlands, grasslands, and deserts away from human development. A small bird, it has a length of 16 centimetres (6.3 in) and a weight of 24–39.5 grams (0.85–1.39 oz). Females and young birds are coloured pale brown and grey, and males have brighter black, white, and brown markings. The House Sparrow feeds mostly the seeds ofgrains and weeds, and insects, and can perform complex and unusual tasks to obtain food. The predators of the House Sparrow include domestic cats, hawks, owls, and many other predatory birds and mammals. The House Sparrow is a very social bird. It is gregarious at all seasons when feeding, often forming flocks with other types of bird. It also roosts communally, its nests are usually grouped together in clumps, and it engages in a number of social activities, such as dust and water bathing, and "social singing", in which birds call together in bushes. The House Sparrow feeds mostly on the ground, but it flocks in trees and bushes. The House Sparrow's nesting sites are varied, but it prefers the shelter of a hole. Nests are most frequently built in the eaves and other crevices of houses. Holes in cliffs and banks, or in tree cavities are also used. It sometimes excavates its own nests in sandy banks or rotten branches, but it more frequently uses the nests of other birds.

Many bird species live closely to humans and have adapted to use man-made structures as nesting sites thus becoming pests in residential areas. Some birds feed on seeds, grains or fruits and are a big problem in agricultural areas. The most common are the common pigeon and the sparrow. There are a wide range of control methods which we have applied in the past with good success.