Of, or relating to environmentalism.
One who holds the view that environment, rather than heredity or culture, is the primary factor in the development of an individual or group.
One who advocates for the protection of the environment and biosphere from misuse from human activity through such measures as ecosystem protection, waste reduction and pollution prevention.
An eager birdwatcher who is willing to travel long distances to see rare species. (See the Wikipedia article for origin.)
Someone or something that twitches.