A native of the east coast of the USA, Spartina alterniflora has been introduced to marshes up and down the west coast as well as to countries such as China. The species has a dense root system that hinders filtration and out-competes native species

http://mdinvasives.org/iotm/feb-2006/

Also known as the blackpoll warbler, their nonstop migration takes them over 2500km from Alaska and northern Canada in the summer to South America and the Caribbean in the winter.

Recently their classification has changed making them part of the Setophaga genus. Their new scientific name is Setophaga striata.