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 he was named in the final 24-man Kiwi squad and was part of the team that went on to win the tournament. In 2013 Sika, through his Tongan heritage, he made his début for Tonga in their Pacific Rugby League International clash with fierce Pacific rivals Samoa. Later in the year Sika represented Tonga in their unsuccessful 2013 Rugby League World Cup campaign. He played in all 3 of Tonga's matches, scoring two tries. He scored both of his tries in New Zealand's nail-biting 2 point defeat by Scotland (unfortunately the only defeat of their World Cup campaign which ultimately