Observers often freeze when they spot a tarantula, imagining a monster straight from a horror film. In reality, these large arachnids spend most of their time doing what all living creatures do: surviving. From filtering water out of their food to sensing vibrations through specialized leg hairs, a tarantula’s daily routine is a masterclass in efficiency. Understanding what tarantulas do reveals a complex world of hunting, hiding, and maintaining the balance of their ecosystems.
Hunting and Feeding Strategies
Unlike spiders that spin intricate webs to catch prey, most tarantulas are active hunters that rely on stealth and power. They do not chase down animals, but rather they sit motionless at the entrance of their burrow, waiting for an unsuspecting insect to pass by. When the opportunity arises, they explode into action, using their powerful legs to tackle the victim and deliver a swift bite. This ambush strategy conserves energy while maximizing the chance of a successful meal, making it a highly effective survival tactic in their native habitats.
The Role of Silk in Hunting
While they do not build webs to trap insects, tarantulas do use silk strategically. They line the entrance of their burrows with triplines, which act like an early warning system. When an insect brushes against these threads, the vibration signals the presence of potential food or danger. Additionally, female tarantulas create silk mats inside their hiding spots to secure their eggs. This use of silk is less about construction and more about communication and protection, proving that these spiders are resourceful engineers rather than simple predators.
Sensing the Environment
Because they have poor eyesight, tarantulas rely heavily on other senses to navigate their world. They are covered in tiny sensory hairs called setae, which detect minute changes in air pressure and vibration. This allows them to locate prey in complete darkness and react to the approach of a predator long before they are seen. They also use chemical cues, tasting the air and their surroundings with specialized hairs on their feet to identify mates and food sources.
Burrowing and Shelter
For the tarantula, the burrow is more than a home; it is a fortress and a climate-controlled sanctuary. Depending on the species, they may dig their own tunnels or occupy pre-existing holes in the ground. They line these chambers with silk to stabilize the walls and create a comfortable space to molt or rest. This behavior is crucial for moisture retention, as they are prone to dehydration in dry environments. A tarantula will rarely wander far from this safe haven, venturing out only to hunt or find a mate.
The Molting Process
Growth is a precarious time for any tarantula, and they must molt their exoskeleton to increase in size. During this vulnerable process, they flip onto their backs and shed their old skin. While the old skeleton is still soft, the spider pumps fluid into its legs to expand its body. They do not eat during this time because the new skin needs to harden completely. Molting is a risky event, and if the tarantula fails to right itself or emerges too early, it can be fatal, highlighting the delicate balance of their survival instincts.
Reproduction and Lifecycle
When the time comes to reproduce, the male tarantula prepares a silken mat and deposits sperm, creating a small packet he can store in his pedipalps. He then seeks out a female, tapping on her burrow to ensure she is receptive. If the female agrees, he inserts his pedipalps into her receptacles, fertilizing her eggs. After mating, the female gets to work, spinning a thick silk sac where she will guard hundreds of eggs. She does not leave this sack until the spiderlings hatch, at which point they climb onto her back for protection, a brief moment of maternal care in an otherwise solitary existence.
