National Geographic : 1959 Mar
Guanayes fly across the sunset to bed down on Santa Island. As darkness falls, the birds always return to land. Long after sundown one can hear the swish of countless wings. Clicking sounds announce collisions of wing tips. Flying in undulating lines, this flock follows 406 its leaders to the nesting colony. © NATIONALGEOGRAPHICSOCIETY Red tide surrounds the author's ship; similar "seas of blood" plague Florida. One-celled organ isms called dinoflagellates sporadically multiply so that they redden the ocean. When tropical waters displace the cool Peru Current, red tide may occur, and fish flee or perish. Many guano birds then die of malnutrition.