The term "Invertebrat" refers to a group of animals that belong to the phylum Arthropoda, Mollusca, Echinodermata, and Annelida. These animals lack a backbone or internal skeleton, and are therefore not considered vertebrates. Instead, they have an exoskeleton, which is comprised of chitin, a tough, flexible protein.

Invertebrates are incredibly diverse, with species found in almost every environment on Earth. From the tiny insects that fly through the air to the massive squids that dwell in the deep ocean, invertebrates have adapted to a wide range of ecosystems and habitats. Some invertebrates, such as insects and spiders, are terrestrial, while others, such as corals and sea stars, are marine.

One of the key characteristics of invertebrates is their ability to move. Many invertebrates are capable of walking, crawling, swimming, or flying, thanks to their specialized body structures and limbs. Insects, for example, have six legs and wings, while spiders have eight legs and rely on their webs to move about.

Invertebrates also play a vital role in many ecosystems. Pollinators such as bees and butterflies are essential for plant reproduction, while decomposers like earthworms help to break down organic matter. Invertebrates are also an important food source for many animals, including fish, birds, and mammals.

German-speaking countries have a rich tradition of invertebrate research and conservation. The State Museum of Natural History in Berlin, for example, has an extensive collection of invertebrates from around the world, while the Albert Ludwig University of Freiburg has a renowned Institute for Invertebrate Systematics. By studying invertebrates, scientists can gain insights into evolutionary history, ecological relationships, and the impact of climate change on ecosystems.

In summary, the term "Invertebrat" refers to a wide range of animals that lack a backbone or internal skeleton. These animals are incredibly diverse, have adapted to various environments, and play a vital role in many ecosystems.	

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