Ticks as external parasites are very important for veterinary Scientists . As they feed on animals, they are depleting large quantity of blood, depending on the size and number of ticks feeding. This leads to weakening animals, reducing their growth and production. The danger of ticks in all its developmental stages including larvae, nymphs and adults comes from its ability to transmit “Haemosporidia” disease to animals and human beings as well as, transmitting other bacterial and virus diseases. Ticks can cause paralysis to animals due to the toxins they carry with their saliva when inserting their mouth parts of animals for feeding. At Nasir's College of Agriculture, 14 tick species were collected from cattle skin and 41 species were collected from the surface layer of the barn. Both collections have included different stages of ticks. Twenty were in the larval and nymphal stages and 35 were at the adult stage . The morphological external characteristics of these ticks were studied for both males and females and the results showed that all spices belong to the genus Ixodes which belongs to the family Ixodidae. They are known as hard ticks. This family includes several genera of which Ixodes is one of them. It is important to make a further survey on different animal farms to study the existence of other genera and to make a map showing the distribution of different genera of ticks.

Key Words :Aden university, Classification, Cattle, Ticks