Sika deer are contiguous with populations of the native red deer. Since the two species sometimes hybridize, a serious conservation concern exists. In research which rated the negative impact of introduced mammals in Europe, the sika deer was found to be among the most damaging to the environment and economy, along with the brown rat and muskrat. In the 1900s, King Edward VII presented a pair of sika deer to John, the second Baron Montagu of Beaulieu. This pair escaped into Sowley Wood and were the basis of the sika to be found in the New Forest today. They were so prolific,
Sika people Catholic mission worked actively since the 17th century; where it is here that their culture acquired European features. Sika people engage in slash-and-burn agriculture with short forms of shifting cultivation. In the west of the coastal area, irrigation is used. Food crops farming include rice, corn, cassava and millet; and other commodities are such as peanuts and coconut palm. Sika people also raise horses, small cattle and poultry. Coastal fishing is also common. Weaving and braiding are well developed. Commodity-money relations are intertwined with numerous survivals of the traditional communal system, where it is manifested in the system of land