In the Amazon Basin, two odontoceti (toothed-whales) species, boto (Amazon River dolphin, Inia geoffrensis) and tucuxi (Sotalia fluviatilis), live sympatrically. The acoustic characteristics of the echolocation clicks of free-ranging botos and tucuxis allow the animals to look for preys and orientate. The high apparent source level and low centroid frequency are possibly due to the difference in body size or sound production organs, especially the nasal structure, the sound source of clicks in odontoceti.
Howler Monkeys take the title for ones of the loudest land mammal in the world. Even though they are quite large in size, you will most likely hear them, before you see them! Due to their enlarged hyoid bone, their distinctive territorial call can be heard up to 3 miles away. The U-shaped bone in the Howler’s throat isn’t hooked to any of the other bones, it really just 'hangs there'. This creates a throat sac in which the monkey's calls resonate before booming out. The monkeys have a variety of different calls for communicating location, protecting territory, and guarding mates.
Pilot whales (Globicephala macrorhynchus / G. melas) (short finned / long finned pilot whale), Pilot whales are inconspicuously dark and relatively large toothed whales of the subfamily Globicephalinae, which is shared with pygmy killer whales, melon-headed whales, false killer whales, Risso’s dolphins and according to some also killer whales. Their acoustic repertoire consists of clicks, pulsed calls, whistles, and complex calls that are considered to be an intermediate or transition form between the first three.
Sperm whales (Physeter macrocephalus)Sperm whales are found throughout the ocean. They produce distinctive sounds called clicks that they use to forage and communicate at large distances. They have the most complex vocal apparatus of all the cetacean species and present a highly complex social structure built over 30 millions of years of evolution.
Humpback whales (Megaptera novaeangliae)Humpback whales are found worldwide. They perform their complex songs primarily during their winter mating season in subtropical waters, but they also sing in the fall before their annual migration begins. Male humpback whales have been described as "inveterate composers" of songs that are "'strikingly similar' to human musical traditions.
The Amazon rainforest is truly an experience for all of the senses: sight, smell, sound, taste and touch. You can hear the sounds of the Amazon and depending on the time of day, season and location, the sounds you hear may greatly vary. A constant buzz from the millions of insects and other creatures is common during both the day and night: monkeys, birds, jaguars…