Amazon River Dolphin

Fascinating facts about the Amazon River Dolphin

• Adult male botos can grow up to 2.55 m (8.4 ft) long and weigh as much as 185 kg (408 lb), while females top out at about 2.18 m and 154 kg, males are roughly 16 % longer and 55 % heavier. This makes the Amazon river dolphin the largest river dolphin and one of the most sexually dimorphic cetaceans, a reversal of the usual pattern where females are bigger.
• In murky Amazon waters botos fire 30 to 80 clicks per second, each a low-amplitude burst that only travels a short distance. By limiting click power they avoid a flood of overlapping echoes, then compensate with a rapid click rate that gives them an almost real-time acoustic picture of cluttered flooded forests. This high-frequency "sonar movie" lets them track fish.
• Boto pods are usually tiny, the average group holds three individuals, but the Amazon has recorded gatherings of up to 37 dolphins, and during a feeding frenzy as many as 35 may cooperate to herd fish. Births peak between May and June, timed with the flood season; calves arrive at 0.80 m long, mothers nurse for about a year, and females space births 15-36 months apart, underscoring a long-term mother-calf bond essential for learning in a complex river habitat.
• The IUCN listed the boto as endangered in 2018, noting a steady population decline driven by fishing-line entanglements, targeted hunting for bait, dam construction and river pollution. Dams they also fragment dolphin populations, shrinking genetic diversity and raising extinction risk.

Sources

Every fact above was checked against these pages, and kept only where one of them states it.

• Wikipedia

At a glance

About the Amazon River Dolphin

In the mystical realm of the Amazon, the river dolphin glides effortlessly, its sleek, grey form undulating through the murky waters with a serpentine elegance, as if born of the very river itself. With a gentle, inquiring nature, it navigates the labyrinthine waterways, its bulbous forehead and slender beak probing the depths for unsuspecting fish, its clicks and whistles echoing through the dense rainforest like an otherworldly melody. As it breaks the surface, its dorsal fin slices through the water, leaving behind a trail of ripples that betray the presence of this elusive, endangered creature, a true marvel of evolution.

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