Free living animals early settled in the living space "town". In the medieval fortified town there was no green. That's why its animal kingdom above all consisted of rocky denizens, because buildings are alike bizarre rocks. They were species, we even today meet in close-built areas and on towers.

The warmer city climate, a relative good food supply and the lack of animal enemies made it easier to settle in towns.

You can meet the Wild domestic dove / Rock dove in all cities of Europe, America and Asia today. It is descended from the rock dove and lives in monogamy. After about 17 days the offsprings are hatching out of the 2 eggs. They are fed first with a quarky pulp, that the crop mucous membrane produces (cropmilk). 4 to 5 weeks later they leave the nest.

Becaus of the large food supply and the artificial light the rock doves breed in the towns in winter, too. So they breed 7-9 times a year. While lots of people enjoy the doves, their excrement corrodes gutters and natural stone.

It's extremely expensive to clean such buildings.

Because of the artificial feeding the stock of doves is very high and that causes deseases and strong blight of parasites. Especially bed bugs and ticks can be transmitted to the people.

The Jackdaw originally had bred on rock faces and in tree holes. Nowadays it mainly settles in high buildings, ruins, in walls and chimneys of villages and towns. It searches for food only in the open landscape with low and gap vegetation. The Jackdaws are sexually mature at the age of two. But they are looking for a partner from the 5th month already (court-ship). Changing the partner isn't unusual at first. But if the partner-bonding has survived more than 6 months it will last until death.

Jackdaws live in swarms with a strict rank order. Starting from the pair-bonding the female takes the rankposition of her male partner.

The Swift best of all native birds has adapted to the life in the air. They eat, drink and copulate flying, they collect their nestmaterial in the air and they even sleep in flight. In contrast to the swallow (they aren't related to) they mostly stay in the higher layers of the air. Swifts are typical birds of almost every town. They breed in colonies for the most part.

Only for a short time they stay in our latitudes. Normally they appear at the end of April /at the beginning if May. And at the beginning of August they migrate to their wintering areas in Central and South Africa.