Complex sentence: The Amazonian manatee has the smallest degree of rostral deflection (25 ° to 41 °) among sirenians, an adaptation to feed closer to the water surface.
Split into simpler sentences: The Amazonian manatee has the smallest degree of rostral deflection (25 ° to 41 °) among sirenians. According to anatomical evidence, this is an adaptation of this species to feed closer to the water surface.