Inclination compass

an inclinometer.

See also: Inclination

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Co-author Robert Gegear, PhD, assistant professor of biology and biotechnology at WPI, explained, "Our study shows that monarchs use a sophisticated magnetic inclination compass system for navigation similar to that used by much larger-brained migratory vertebrates such as birds and sea turtles.
Robert Gegear, co-author and assistant professor of biology and biotechnology at WPI, said the study showed that monarchs "use a sophisticated magnetic inclination compass system for navigation similar to that used by much larger-brained migratory vertebrates such as birds and sea turtles.