I posted earlier about how Endangered Species Day really needs to be every day, especially in a densely populated state like New Jersey. I live in Essex County, New Jersey, one of the most densely populated counties in the state—and in the entire U.S. As of 2024 estimates, it has roughly 850,000 residents living within about 130 square miles, giving it a population density of around 6,500 people per square mile. Essex ranks among the top three most densely populated counties in New Jersey, alongside Hudson and Union.
But it is not without wildlife and green areas, and, of course, some rare, endangered, and threatened wildlife and plant species. Newark, East Orange, and Irvington account for much of that density, with Newark alone exceeding 11,000 people per square mile. But towns such as Cedar Grove, Montclair, and Livingston are less dense—typically 2,000–4,000 people per square mile—but still tightly settled compared to rural counties.
High population density means fragmented habitats and pressure on green spaces, making local conservation efforts—like those highlighted in the poster —especially vital. Protecting remaining wetlands, forest corridors, and stream buffers helps maintain biodiversity amid urban growth.
The poster highlights the rare wildlife found across the county’s forests, wetlands, and river corridors—from the Watchung Mountains to the Passaic and Rahway watersheds. It features species such as the bog turtle, timber rattlesnake, Indiana bat, and peregrine falcon, along with native plants like swamp pink and American chaffseed that thrive in protected habitats. All of these depend on the Watchung Mountains and Passaic River corridor for survival.
