Zookeepers caught our new siamangs, "Leela" and "Merlin," calling for the first time since their arrival at the zoo! Both the male and female participate in this "duet," which both strengthens their bond and announces their territory. Siamangs have a specialized throat sac that you can see inflated in the video, which makes these unique sounds possible! | Cape May County Park/Zoo

Listen to this harmonious duet from our Siamang gibbons Kera and Intan! Siamang gibbon couples will sing a daily duet together which is a song made up of four distinct types of vocalisations– booms, barks, ululating screams and bitonal screams. Each gibbon will sing a different piece of the song which helps to advertise their strong bond as a mated pair. In the wild, this acts as a deterrent for other gibbons in their vicinity, letting them know that this territory is taken. When compared to oth