Indus River Dolphin
Species principle: Sound Navigation
Hear the river path.
There is more than one way to see the path.
Indus River Dolphins have very poor vision and rely heavily on echolocation to navigate and hunt in turbid river water.
Animal Powers
Echolocation
Hear the river path.
Animals grouped here express a similar power through their behavior in nature. Each species still has its own principle, lesson, meaning, and field-guide page.
3 species
Oilbird
Species principle: Cave Echolocation
Hear the cave.
The dark becomes navigable when you learn to hear its shape.
Oilbirds are nocturnal fruit-eating birds that nest in caves and use audible clicks for echolocation while navigating in darkness.
Yangtze Finless Porpoise
Species principle: River Smoothness
Glide without a fin.
A smooth design can move through pressure without making noise about it.
Yangtze Finless Porpoises lack a dorsal fin and use streamlined bodies, echolocation, and agile swimming to live in freshwater river systems.