Butler, C / July 2002 – vol. 95, issue 7, pp 345–348 In October 2000, the author began a study on the population biology of Rose-ringed Parakeets Psittacula krameri in Britain. It was discovered that not only were Rose-ringed Parakeets more numerous and widespread than was previously thought, but that three other parrot species were nesting in Britain as well. ... This article is only available to registered users.To read more, please log in or purchase a subscription.