Serval has lost the ability to speak. According to Black Rhino and White Rhino, it happened due to an illness that's been going around in the Waterfront Area...
They're a tough duo that 
can protect us from Ceruleans.
إنّهما ثنائي قويّ يستطيع حمايتنا
من السيروليان
Ein bärenstarkes Duo, das uns
vor den Ceruleans beschützen kann.
Sono un duo potente che può proteggerci dai Cerulean.
Elas são uma dupla durona que
pode nos proteger dos Ceruleans.
Внушительный дуэт,
защищающий нас от лазурианов!