So far, U.S. Geological Survey biologists have put Tasul and her brother Conrad on two diets. One was made up of meat from land animals and the other was composed of seafood. "We like to think of it as the surf and turf experiment," Amy Cutting, an Oregon Zoo curator, told the USGS. The researchers' measurements show the bears' meals affect their fur and blood for far longer than previously thought. "Until now, we assumed that blood represented what a bear ate over the past one to two months, but our results suggest those samples represent diet up to six months or more," USGS wildlife biologist Karyn Rode said.