Crows are commonly known as kunguru or kurabu because of their harsh sounds and feeding habits. They were introduced to East Africa particularly Zanzibar and Kenyan Coast around 1897, and later Port Sudan and Australia by sea merchants.

In Zanzibar, where the crows are a major nuisance, they were introduced to clear refuse in the town. They birds are extremely bold and curious and can hitch rides on ships, trucks and lorries.

They are known to have spread to various parts of the world by hiking rides on ships. A small colony has been spotted in Holland after they were ferried there by American warships.

The crows, also known as the Colombo, originated from Asia but have been assisted by ships to spread across the world. The crow arrived in Europe and has been breeding in the Hook of Holland since 1998.

It has also made its presence in Cork Harbour on the south coast of Ireland since early September 2010. It feeds largely on refuse around human habitations, small reptiles and insects and other small invertebrates, eggs, nestlings, grain and fruits.

The crow is a highly opportunistic bird and given its omnivorous diet, can survive on nearly anything. Some trees in the local environment appear to favour their breeding.

Each bird lays between three to six eggs in a typical stick nest. Large trees with big crowns are preferred for nesting. Mombasa and Coast Tourist Association chief executive officer Ms Millicent Odhia