Ethan Walker 
When predators disappear, ecosystems can change in ways that are much bigger than one missing animal. Prey animals may become more numerous, change where they feed, or spend less time watching for danger. Smaller predators may expand into new areas. Plants can face heavier browsing or grazing. Scavengers may lose some of the carcasses that … Read more
A keystone species is an organism whose role is unusually important to the structure of its ecosystem. The idea is not that the species is always the biggest, rarest, or most aggressive animal in a habitat. It is that the ecosystem can change in major ways when that species declines or disappears. Predator-based examples are … Read more
Food webs show how animals, plants, fungi, bacteria, and other living things are connected by feeding relationships. A food chain can make nature look like a straight line, but real ecosystems are usually more like a net: one animal may eat several foods, become food for several predators, and affect the habitat around it in … Read more
Green spaces help wildlife by giving animals places to find food, water, shelter, nesting sites, shade, and safer movement routes inside cities. A park, riverbank, garden, campus, cemetery, street tree corridor, wetland, vacant lot, or green roof can become part of an urban habitat network when it offers real ecological value instead of just open … Read more
Window strikes and birds are connected by one of the most ordinary things in human buildings: glass. A window may look clear, reflective, harmless, or decorative to us, but a bird can read that same surface as open sky, tree cover, or a safe flight path. The result is a collision that may injure or … Read more
Roadkill and wildlife are connected by a simple problem: roads often cut across the places animals need to move. A deer may cross to reach feeding areas. A turtle may leave a wetland to nest. A frog may move during a rainy breeding night. A hawk may land near a carcass. When those normal movements … Read more
Wildlife crossings are structures that help animals move across roads without stepping directly into traffic. They can look like planted bridges, wide underpasses, small tunnels, modified culverts, canopy ropes, or fenced guide systems that lead animals toward a safer route. The idea is simple, but the biology behind it is not: different animals move for … Read more
Noise pollution affects wildlife by making it harder for animals to communicate, find mates, detect predators, locate prey, move through habitat, and use areas that would otherwise be suitable. For many animals, sound is not background decoration. It is part of how they survive. A busy road, aircraft route, construction site, boat channel, or loud … Read more
How animals find their way during migration is one of the most impressive questions in animal behavior. A bird may cross a continent at night, a sea turtle may return to a nesting region after years at sea, a salmon may move from ocean feeding grounds back toward its natal river, and a monarch butterfly … Read more
Animals that use electricity are not science fiction. Some fish generate electric fields with specialized organs, while other animals detect tiny electric fields produced by muscles, nerves, and movement in water. For electric eels, electric rays, and electric catfish, electricity can help with hunting or defense. For sharks, rays, platypuses, and many weakly electric fish, … Read more
