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 Manu ended Tonga's hopes of a knock-out round spot). On 2 May 2015, Manu captained Tonga in their 2015 Polynesian Cup test-match against Pacific rivals Samoa. On 17 October 2015 Manu captained Tonga again this time in their Asia-Pacific Qualifier match against the Cook Islands for the 2017 Rugby League World Cup. On 7 May 2016, Manu traveled down from Hull to Sydney to captain Tonga in the 2016 Polynesian Cup against Samoa, where he started in the second row in the 18-6 loss at Parramatta Stadium. In 2018 he announced his retirement from international rugby league. Sika Manu Viliami Sikalamu