Imperial units commonly used units for length are (li), (tseung/cheung), (tsek/chek), (tsun/chun), (fen/fan) in descending scale order. These units are now rarely used in daily life, the imperial and metric systems being preferred. The imperial equivalents are written with the same basic Chinese characters as the Chinese system. In order to distinguish between the units of the two systems, the units can be prefixed with "Ying" () for the Imperial system and "Wa" () for the Chinese system. In writing, derived characters are often used, with an additional (mouth) radical to the left of the original Chinese character, for writing imperial units.
Imperial woodpecker In Gallagher's novel, "The Grail Bird", in 2006, he discusses how difficult the search is for the imperial woodpecker due to its dangerous location. In Mexico's Sierra Madre Occidental, there are major marijuana and poppy-growing regions that are patrolled by armed guards. The drug cartels often kill anyone who comes close to their crops. The imperial woodpecker is known from about 160 museum specimens and a single amateur film from 1956 depicting one bird climbing, foraging and flying. The film has been restored and released by Cornell University. Gallagher's inspiration to search for the imperial woodpecker was the discovery of