Habitat

A habitat is a special home.

It is where living things find food. They also find water there.

Some animals need a lot of space. Others live in tiny spots. A bug might live on one leaf.

A home can even be a log. A habitat can change over time. A fire or a storm can change it. This is how nature works.

A habitat is a special place where a living thing lives.

It provides the things an animal or plant needs to survive. These needs include food and water. A habitat also has specific parts like soil, light, and temperature.

Some living things can live in many places. We call these species generalists. Other living things need very specific things to stay alive. We call these species specialists.

For example, one butterfly only lives in certain grasslands.

Habitats can be very big or very small. A habitat might be a large forest or a desert.

It can also be a tiny spot. This is called a microhabitat. A microhabitat might be a single leaf or a rotten log.

Habitats can change. A volcano or a storm can change a home quickly. Changes can also happen slowly over a long time. Human activities like building cities can change habitats too. Even cities can become homes for animals like birds and foxes.

A habitat is the natural home of a living thing. It is the place where a species can find everything it needs to survive and have babies. This includes food and the presence or absence of predators. A habitat also provides physical things like soil, moisture, light, and temperature. You can think of a habitat as the physical version of an ecological niche. An ecological niche is the specific role a creature plays in its home.

How a habitat works depends on what a species needs. Some living things are called habitat generalists. These creatures can thrive in many different kinds of environments. For example, the small white butterfly Pieris rapae lives on almost every continent except Antarctica. Other living things are called habitat specialists. These creatures need a very limited set of factors to stay alive. The large blue butterfly Phengaris arion only lives in chalk grasslands. It needs specific plants and even needs certain ants to live nearby.

People have used the word "habitat" since about 1755. It comes from the Latin word habitāre, which means to inhabit. This is related to the word habēre, meaning to have or to hold. Scientists use different terms to describe different scales of life. They might use "habitat-type" to describe many species living in one area. A biotope is a similar term for an area with the same environmental conditions.

Habitats come in many different sizes and types. There are terrestrial habitats on land, like forests, grasslands, and deserts. Arid habitats are very dry places like the deserts in Egypt. Freshwater habitats include rivers, lakes, and ponds. Marine habitats are in the ocean, such as coral reefs or the deep seabed.

Some habitats are even tiny and are called microhabitats. A microhabitat could be a single leaf, a rotten log, or even the inside of a plant stem.

Habitats do not always stay the same. They can change because of violent events like volcanoes or tsunamis. Changes can also happen slowly over thousands of years as the climate shifts. Human activities like damming rivers or cutting down forests also change homes. Even cities can become habitats for many animals. For example, about 2,000 coyotes live in and around Chicago.

In ecology, a habitat is the specific collection of resources and biotic factors that support a species' survival and reproduction. It is the physical manifestation of a species' ecological niche. While the terms environment or vegetation assemblage describe general areas, habitat is a species-specific term. It includes both physical factors, such as soil, moisture, temperature range, and light intensity, and biotic factors, like food availability and the presence of predators.

Every species has unique habitat requirements that dictate where it can live. Some organisms are habitat generalists, meaning they can thrive across a wide array of environmental conditions. An example is the small white butterfly, Pieris rapae, which lives on every continent except Antarctica because its larvae feed on many different plant species. In contrast, habitat specialists require a very limited set of factors. The large blue butterfly, Phengaris arion, is a specialist that only lives in chalk grassland areas. It requires specific Thymus species for its larvae and depends on the presence of Myrmica ants to complete its complex life cycle.

Habitats exist at many different scales, including microhabitats. A microhabitat is a small-scale area with unique physical requirements like light, humidity, or air movement. For instance, the lichens on the north face of a boulder differ from those on the south face or the top. Within a single wood, microhabitats include tree trunks, branches, leaves, and even the soil. Even a single leaf, such as those of the Alnus nepalensis tree, can serve as a microhabitat for a leaf beetle.

Scientists categorize habitats into several broad types. Terrestrial habitat types include forests, grasslands, wetlands, and deserts. Arid habitats, such as the deserts in Egypt, are defined by very little available water.

Freshwater habitats include running waters like rivers and streams, or standing waters like lakes and bogs. Marine habitats cover the oceans, ranging from coral reefs and estuaries to the deep benthic zone of the seabed.

Some organisms even find habitats within other living things, such as a parasite living in the digestive tract or cells of a host.

Life in extreme habitats requires specialized biological adaptations. In arid environments, some frogs live underground to create moist habitats and hibernate during dry periods. The Couch's spadefoot toad emerges from its burrow only during downpours to lay eggs in transient pools. Its tadpoles can undergo metamorphosis in as little as nine days. Similarly, fairy shrimps can lay "winter eggs" that resist drying out. These eggs can remain dormant in the dust for as long as fifteen years until new water arrives.

Habitats are not permanent and can change through various processes. Change can be caused by violent events like volcanic eruptions, earthquakes, tsunamis, or wildfires.

Changes can also occur gradually over millennia through climate shifts, such as the advance or retreat of glaciers. Human activities also cause significant changes, including deforestation, the damming of rivers, and the dredging of the seabed. Furthermore, the introduction of alien species can devastate native wildlife through competition, predation, or the spread of new diseases.

Even human-made urban environments function as habitats for adaptable generalists. In cities, pigeons and sparrows use buildings for nesting, while bats use roof spaces for roosting. Many animals, such as rats, mice, and foxes, have followed humans globally. In Chicago, it is estimated that about 2,000 coyotes live in and around the city. In warmer climates, urban habitats also host many species of termites, with 183 species known to affect buildings.