Ptarmigans are birds that stay in the arctic year round and change their brown feathers to white when winters come.
(Ptarmigans; are; birds that stay in the arctic year round and change their brown feathers to white) (birds; stay; in the arctic year round) (birds; change; their brown feathers; to white; T:when winters come) (winters; come; )
Ptarmigans birds birds winters
are stay change come
birds that stay in the arctic year round and change their brown feathers to white
in the arctic year round
their brown feathers to white T:when winters come