Spiders have a wide variety of self-defense mechanisms. Their body postures and gestures can communicate danger. The most obvious defensive strategy is raising their abdomens to the sky. They are also adept at using their webs to protect themselves.
In addition, they have hairs on their legs that are sensitive to changes in moisture. They are also sensitive to vibrations. This makes them excellent at hearing other creatures and even moving them. The same hairs can detect changes in electrical currents in the air.
Another important defensive mechanism is the use of their fangs. These piercing teeth can strike an aggressor before they bite. Some spiders also have modified claws for handling silk. They also use chelicerae to grasp prey.
They also hydrate themselves by drinking directly from small puddles. Their legs are covered in striking colors. These colors help to reinforce their message of danger. In some species, the color of their undersides can be red, black, green, or yellow.
They also have two large jaws. They are known as mygalomorph spiders. These animals are more adept at manipulating their prey than other species.
They are also able to control their blood pressure. A spider’s heart is situated in the midline of their body. During moments of stress, their blood pressure increases. This causes their thoracic muscles to contract and their limbs to extend outwards.
A spider’s pedicel is a thin tube that connects its opisthosoma to its front. The opisthosoma is a body segment that contains digestive and reproductive organs.