They are recorded in the Dictionary of Danish Insular Dialects (Ømålsordbogen)[1] which has been collected since the 1920s, and published in biannual volumes since 1992.
A major difference is between Modern Danish and the traditional insular dialects are that some of them lack the stød but kept the tonal accent.
By 1900, Zealand insular dialects had been reduced to two genders under the influence from the standard language, but other varieties like Funen dialect had not.
The old Insular or Funen dialect could also use personal pronouns in certain cases, particularly to refer to animals.
[3] A classic example in traditional Funen dialect is the sentence Katti, han får unger (literally, The cat, he is having kittens).