Facts about Peruvian Amazon Dolphins
- 09
Male Amazon river dolphins, known locally as botos, are notably larger than females, a rare trait called male-biased sexual dimorphism among cetaceans.
- 08
Genetic analysis reveals Amazon river dolphins diverged from ocean-dwelling cetaceans approximately 25 million years ago during the Oligocene epoch, making them evolutionary relics of ancient marine ancestry.
- 07
Boto dolphins consume approximately 2.5 percent of their body weight in fish daily, requiring them to hunt continuously throughout daylight hours in the Amazon River system.
- 06
Inia geoffrensis dolphins possess a melon organ in their forehead that can be voluntarily deformed to focus echolocation beams on specific prey items with remarkable precision.
- 05
Freshwater Amazon river dolphins possess unfused neck vertebrae allowing their heads to rotate up to 90 degrees, enabling them to navigate flooded forests and locate prey in submerged vegetation.
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Amazon river dolphins typically live 28 to 30 years in the wild, making them among the longest-lived freshwater cetaceans in South America.
- 03
During mating season, male Amazon river dolphins produce distinctive clicks and whistles at frequencies up to 40 kilohertz to attract females and establish territorial dominance.
- 02
The Amazon river dolphin's brain is approximately 40 percent larger than a human brain relative to body size, enabling complex social behaviors and problem-solving abilities.
- 01
Pink river dolphins in the Amazon can echolocate frequencies up to 128 kilohertz to navigate murky waters and locate fish.