Tern sea terns have light grey or white body plumage as adults, with a black cap to the head. The legs and bill are various combinations of red, orange, yellow, or black depending on species. The pale plumage is conspicuous from a distance at sea, and may attract other birds to a good feeding area for these fish-eating species. When seen against the sky, the white underparts also help to hide the hunting bird from its intended prey. The Inca tern has mainly dark plumage, and three species that mainly eat insects, the black tern, white-winged tern, and black-bellied tern, have
Simple Rules: How to Thrive in a Complex World Simple Rules: How to Thrive in a Complex World Simple Rules: How to Thrive in a Complex World is a 2015 business strategy book co-authored by Donald N. Sull, a Senior Lecturer at the MIT Sloan School of Management, and Kathleen M. Eisenhardt, a Professor at the Stanford University School of Engineering. Sull and Eisenhardt suggest that a limited set of simple rules must be applied to solve specific problems in complex situations. This thesis, which emphasizes "short cut strategies", is the best way for businesses to solve problems. The book illustrates this with many case studies, ranging "from medical