I won't be able to describe it in words so maybe this audio file will help.
http://www.purplemartin.org/main/Vocalization.html
Joe
Purple martins are fairly noisy, chirping and making sounds that have been described as chortles, rattles, and croaks.
no
There is a bird that is called martin and it is a type of swallow. There are purple martins, house martins, and sand martins.
Purple Martins - 1997 was released on: USA: 18 October 1997 (New Orleans Film and Video Festival)
USA and Canada
yes or no and why is it endangered The purple martin is not an endangered species, and its habitat is still quite good.
Contrary to popular belief, the thought that Purple Martins reduce mosquito population was brought up to promote the products that went along with the birds such as housing, and gourds. http://www.purplemartin.org/update/MosCont.html is research that was conducted to back it up. But don't get me wrong, Martins have many advantages. Just hearing that beautiful song they produce makes it worthwhile to attract Martins to your backyard.
Purple martins are completely dependent on humans for nesting boxes. Martins will travel hundreds of miles to return to their nesting boxes as long as they are kept up properly.
empty gourds make great purple martin houses.put up several on a wire,at least 12 feet high,and you will have a coloney of martins.
Hypothesis ALS+ C;
Primary cavity nesters make their own cavities (woodpeckers) and secondaries use existing cavities (Purple Martins).
Purple martins were initially though to be closely related to European House Martins due to their forked tail, but they are only distantly related, is one though. Another theory is that they were named after the Roman god of war "Mars" and the "tin" or "ten" is a pet name...so basically "little mars" either due to their tenacity in chasing off predators or perhaps as Mars refers to the first month of the calendar, when the first martins start to return. The Purple part is a misnomer since they are really a deep blue-not purple.