Rail (bird)

Rails are small birds that live near water.

They like to hide in tall grass. They also live in forests and fields.

Many rails have short wings. Because their wings are short, they are not strong fliers. They often choose to run on the ground instead.

Some rails live on islands. On these islands, they may stop flying all together. This helps them save their energy.

These birds can be very shy. They like to stay hidden in thick plants.

They use loud calls to talk to each other.

Rails are very interesting birds to watch!

Rails are a large family of birds. They live on every continent except Antarctica. Most rails live near water. They like marshes, rice paddies, and flooded fields. They love thick plants for nesting.

Many rails have short, round wings. They are not strong fliers. Because of this, they often prefer to run. Some rails live on islands. On these islands, many rails became flightless. This means they lost the power to fly.

Losing flight helps them save power. Flying uses a lot of energy. On islands without predators, they do not need to fly far. This helps them survive when food is hard to find.

Rails can be very shy. They stay hidden in thick grass. They use loud calls to talk. This helps them find others in dark or thick places.

Some rails are in danger. Humans changed the land on many islands. New animals like cats and rats were also brought there. This makes it hard for some rails to stay safe.

Rails are a large family of small to medium-sized birds. You can find them on every continent except Antarctica. Most rails live near water in places like marshes or rice paddies. They love to hide in thick, wet plants to build their nests. These birds come in many shapes and sizes. Some have long necks, while others have very different bills. For example, the clapper rail has a long bill. The coot has a short, wide bill. The purple gallinule has a very large bill.

Many rails are not very strong at flying. They have short, rounded wings that do not provide much power. Because of this, many rails prefer to run through thick grass instead.

Some rails even lose the ability to fly entirely. This is a process called flightlessness. This happens often on islands where there are no predators. Flying uses a lot of energy and heavy muscles. By losing these muscles, the birds save energy. This makes it easier for them to survive when food is hard to find.

Scientists have studied how these birds change over time. The family name Rallidae was given by Constantine Samuel Rafinesque in 1815. We know that flightlessness can happen quite fast. The Laysan rail only needed about 125,000 years to lose its flight. This change helped the birds fill different roles on their islands. They can grow into many different sizes to use the space well. This is a great example of how animals adapt to their homes.

Rails are very busy living things with many different habits. Most are omnivores, which means they eat both plants and small animals. They might eat fruit, seeds, or tiny bugs. They are often shy and stay hidden in the reeds. To talk to each other, they make very loud calls. These sounds help them find friends in the dark or in thick plants.

Some species, like the takahē, are quite large. The smallest rail is Swinhoe's rail, which weighs only 25 grams.

Sadly, many rails face hard jobs today because of human changes. When people moved to islands, they brought new animals like cats and rats. These predators make it very hard for flightless birds to stay safe. In the past, hundreds of island rail species became extinct.

Some birds, like the Guam rail, almost disappeared because of snakes. However, people are working hard to help them. Conservation groups take some birds into care to help them breed. This gives these special birds a better chance to survive.

Rails belong to the avian family Rallidae. This is a large and diverse group of small to medium-sized birds. They are mostly terrestrial, meaning they live on the ground, or semi-amphibious. You can find members of this family on every continent except Antarctica. They thrive in almost every habitat except for dry deserts, polar regions, or high alpine areas. Many species are closely tied to wetland habitats like marshes, rice paddies, and flooded fields. They often seek out dense vegetation for nesting and protection.

The physical appearance of a rail can vary significantly. Some species possess long necks, and many have bodies that are laterally compressed. This means their bodies are flattened from side to side, helping them move through thick reeds. Their bills are perhaps their most diverse feature. For instance, the clapper rail has a bill longer than its head. In contrast, the coot has a short and wide bill. The purple gallinule has a massive bill. Some birds, like the horned coot, even have a frontal shield. This is a fleshy extension of the upper bill.

Flight is a unique aspect of Rallidae biology. Most rails have short, rounded wings. While their flight is not powerful, it can be sustained for long periods. This allows many species to migrate annually. However, their weak flight makes them easy to blow off course. This trait makes them common vagrants, which helps them colonize isolated oceanic islands. Because they often prefer running through dense habitats, many species have evolved to be flightless. This is a famous example of parallel evolution. Out of roughly 150 historically known species, 31 evolved flightlessness from volant, or flying, ancestors.

Flightlessness offers several biological advantages on islands. Flying requires immense energy. The keel and flight muscles can take up to 40% of a bird's total weight. By reducing these muscles, a rail lowers its metabolic demands. This energy conservation makes it easier to survive when island resources are limited. This process can also lead to diversification. Different sized flightless rails can evolve on the same island to fill various ecological niches. In rails, flight muscles typically make up only 12% to 17% of their body mass. This low starting point may contribute to how quickly they lose flight. The Laysan rail, for example, evolved reduced wings in only 125,000 years.

Behaviorally, most rails are omnivorous generalists. They eat a variety of foods, including invertebrates, fruit, and seedlings. Some species are primarily herbivorous. Rails are often shy and secretive, making them difficult to observe in the wild. To communicate in dense vegetation or at night, they use very loud calls. These calls can be whistle-like or squeak-like. In the Old World, birds with long bills are often called rails, while those with short bills are called crakes. In North America, both are simply called rails. The smallest is Swinhoe's rail at 25 grams. The largest is the takahē.

Human activity has had a profound impact on rail populations. Many island species have suffered disproportionately from environmental changes. When humans colonized islands, they introduced terrestrial predators like cats, foxes, rats, and pigs. Because many island rails are flightless, they cannot easily escape these new threats. It is estimated that several hundred species of island rails have gone extinct due to these changes. In the Pacific, the colonization of islands led to the extinction of 750 to 1,800 bird species, half of which were rails.

Some species, like the Guam rail, faced extinction due to the introduction of brown tree snakes.

Conservation efforts are currently working to protect remaining species. Some birds, such as the Lord Howe woodhen and the takahē, have made modest recoveries. For the Guam rail, scientists took the last remaining individuals into captivity. These birds are now breeding well in controlled environments. While reintroduction attempts have seen mixed results, these programs are vital for preventing total extinction. Understanding the history and biology of the Rallidae helps scientists protect these diverse and specialized birds.