4/2/2023 0 Comments Are squids invertebrates![]() ![]() They are found throughout the world's oceans from the warm waters of the tropics down to subzero temperatures in polar regions. All 1000 or so species are voracious carnivores, with large brains, complex behaviours and the ability to change colour, texture and shape to elude hungry predators keen to snack on the soft-bodied animals. Spiders can only ingest liquids they bite holes in their prey and inject enzymes that dissolve the tissues so they can be sucked out.Cephalopods include squid, cuttlefish, octopuses and nautiluses. Some spiders inject poison into their prey to kill it, while others prefer to wrap up their live catch and save it for later. They also are very sensitive to vibration, which comes in handy when prey gets stuck in their web. Most spiders have eight eyes, and can sense light and dark. The leg span of species ranges from 0.02 of an inch to 10 inches. Some spiders live on land and others live in the water. Experts think there are about 170,000 species of spiders in the world, but only around 39,000 are described and named. They are not insects because they have eight legs (insects have six legs). Spiders make their home on every continent except Antarctica. Humans, some fishes and sperm whales eat squid. Some squids are luminous, which means they have light organs in their skin that let them change color to camouflage themselves, attract prey and communicate with other squids. Their length ranges from about 3/4 of an inch to more than 65 feet. Squids live in the ocean, both near the shore and in the ocean depths. Each tentacle has four rows of suckers that help them catch prey (usually fish) and attach themselves to surfaces. ![]() They are different from octopuses, which have eight arms. Squids are decapods, meaning they have 10 arms or tentacles. These organisms have the unique ability to lose and regrow their arms. Snails, mussels and clams are common foods for starfish, which use their arms to guide food particles from the water into their mouths. Starfish have tube feet that work with hydraulic pressure to help them move. ![]() Most have five arms, but one species is known to have 24 arms. There are over 1,600 species of starfish. Some starfish live deep in the oceans, while others live on the shore. Starfish are also called sea stars because of the arms or “rays” they have sticking out of their bodies. Birds and other animals use earthworms as a food source. Earthworms can detect light and vibrations, but they are blind and cannot hear. The bodies of worms are divided into segments in certain species, some of the organs are duplicated in each segment. Earthworms eat pieces of plants and animals in the soil. They are one of more than 1,800 species of worms that live on land. Earthworms, also called angleworms, are very important in the world because their burrowing turns over and aerates the soil, provides soil drainage and mixes in organic material. ![]()
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