According to the Department of Education 180 is the minimum number of instructional days California requires of its public schools. The 180 days doesn`t include in-service days for teachers.
Loon, Arctic also Black-throated Loon also Black-Throated Diver Gavia arctica Found: North America (Alaska), Europe, Asia. The Arctic Loon has white underparts. Breeding has black back with white bars; black face; black sides of throat with white stripes; dark green throat.
Common loon. The common loon (Gavia immer) is a large member of the loon, or diver, family of birds. The species is known as the great northern diver in Eurasia; another former name, great northern loon, was a compromise proposed by the International Ornithological Committee. 1 Taxonomy.