Podcasts > Stuff You Should Know > Short Stuff: Roly Poly...Bugs? | STUFF YOU SHOULD KNOW

Short Stuff: Roly Poly...Bugs? | STUFF YOU SHOULD KNOW

By iHeartPodcasts

Dive into a fascinating episode of "Stuff You Should Know" with Josh Clark and Chuck Bryant as they unravel the mysteries of the commonly misidentified garden dwellers known as roly-polies. These creatures are not the insects they are commonly mistaken for but are in fact, crustaceans who breathe through gills and have remarkably adapted to terrestrial life. Listen as Josh and Chuck explain the unique behaviors of these creatures, from how they roll into a ball to protect themselves to their uncommon dietary habits, and gain insight into the surprisingly complex life of these small beings.

In their exploration, Josh and Chuck also shed light on the ecological benefits that roly-polies confer upon our gardens and compost heaps, demonstrating that they are allies rather than foes in horticultural environments. Furthermore, get a sense of how these land crustaceans could play an instrumental role in pollution clean-up due to their ability to ingest and neutralize heavy metals. Join this episode of "Stuff You Should Know" for an enlightening look into the underestimated and often overlooked, the humble roly-poly.

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Short Stuff: Roly Poly...Bugs? | STUFF YOU SHOULD KNOW

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Short Stuff: Roly Poly...Bugs? | STUFF YOU SHOULD KNOW

1-Page Summary

Roly-polies are crustaceans, not insects

Roly-polies, often mistaken for insects due to their small size and ubiquity in gardens, are actually crustaceans, a group that comprises crabs, lobsters, and shrimp. These creatures are particularly notable as the sole crustaceans that have fully adapted to land living. Interestingly, despite their terrestrial habitat, they continue to breathe through gills and thus require moist environments to facilitate their respiratory system.

How roly-polies can roll into a ball (conglobation) as a defense mechanism

When faced with threats, roly-polies engage in a defense behavior known as conglobation, which involves curling up into a tight ball. This not only protects them from predators but also helps to preserve moisture in their gills, which is vital for their survival, especially in drier climates.

Roly-polies eat their own feces to extract more nutrients (self-coprophagy)

Exhibiting a behavior termed self-coprophagy, roly-polies consume their own feces to recapture nutrients that were not absorbed during the initial digestion. Such a practice enhances their nutrient intake from what they consume.

Roly-polies help with composting and are beneficial for gardens

Roly-polies contribute substantially to composting and are advantageous to gardens. Their dietary focus on decaying vegetation and carrion significantly aids in the decomposition process, thereby enriching the soil with nutrients and improving its fertility. Notably, they are not plant-threatening pests and do not carry diseases, reflecting their crucial role in maintaining a healthy soil ecosystem and reinforcing their status as helpers rather than harmful inhabitants of gardens.

Roly-polies can crystallize heavy metals in their bodies to clean up polluted areas

In a display of their environmental utility, roly-polies have the astonishing capability of ingesting and crystallizing heavy metals within their bodies. This phenomenon could be harnessed to detoxify and reclaim polluted environments, positioning these creatures as potential agents in ecological cleanup and restoration efforts.

1-Page Summary

Additional Materials

Clarifications

  • Roly-polies, also known as woodlice or pill bugs, belong to the crustacean group, which includes marine animals like crabs and lobsters. Despite their appearance and habitat, they are not insects but are more closely related to aquatic creatures like shrimp. This distinction is based on their anatomy, reproductive methods, and evolutionary history, which align them with crustaceans rather than insects.
  • Roly-polies, also known as woodlice or pill bugs, have gills that are used for breathing. These gills need to stay moist to function properly, which is why roly-polies require humid environments to survive. This adaptation allows them to respire effectively despite living on land.
  • Roly-polies have the ability to curl up into a tight ball as a defense mechanism when they feel threatened. This behavior, known as conglobation, helps protect them from predators and also aids in retaining moisture in their bodies. By rolling into a ball, roly-polies can shield their vulnerable underside and increase their chances of survival in the face of danger. This unique defense strategy is a crucial adaptation that has evolved to enhance their chances of survival in their environment.
  • Roly-polies engage in self-coprophagy, a behavior where they consume their own feces to extract additional nutrients that were not absorbed during the initial digestion. This process allows them to maximize their nutrient intake and adapt to their environment more effectively. Self-coprophagy is a common practice among certain species, including roly-polies, to enhance their nutritional efficiency. By recycling their waste in this manner, roly-polies can thrive in their habitats and maintain their essential nutrient levels.
  • Roly-polies have the unique ability to ingest heavy metals and store them in their bodies in a crystallized form. This process is a natural defense mechanism that helps them survive in polluted environments. By sequestering heavy metals, roly-polies can potentially aid in cleaning up contaminated areas by removing these toxic substances from the soil. This remarkable trait showcases their potential role in environmental remediation efforts.

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Short Stuff: Roly Poly...Bugs? | STUFF YOU SHOULD KNOW

Roly-polies are crustaceans, not insects

Despite their small size and common presence in gardens, roly-polies are not insects. They are, in fact, crustaceans—a group that includes crabs, lobsters, and shrimp. Originally from the Mediterranean, these unique creatures have successfully spread across the globe.

They are the only crustaceans adapted to live entirely on land

Roly-polies are unique in the crustacean family; they are the only members that have adapted to a terrestrial lifestyle. Their adaptation is a significant evolutionary step, distinguishing them from their aquatic relatives.

They breathe through gills even while living on land

Remarkably, roly-polies have retained the ...

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Roly-polies are crustaceans, not insects

Additional Materials

Clarifications

  • Roly-polies belong to the group of crustaceans, which also includes crabs, lobsters, and shrimp. Despite their appearance and habitat, roly-polies are more closely related to these marine creatures than to insects. This unique connection to crustaceans sets them apart from insects, showcasing their evolutionary divergence from typical land-dwelling bugs.
  • Roly-polies, also known as woodlice or pill bugs, have adapted to living on land by developing specialized structures called pseudotracheae that help them breathe. These structures are located on their underside and allow for gas exchange in their terrestrial environment. Additionally, their ability to conserve water and seek out moist habitats further supports their adaptation to life on land. This unique evolutionary trait sets them apart from other crustaceans, which typically l ...

Counterarguments

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Short Stuff: Roly Poly...Bugs? | STUFF YOU SHOULD KNOW

How roly-polies can roll into a ball (conglobation) as a defense mechanism

Roly-polies, which are capable of curling up into a tight ball, exhibit a behavior known as "conglobation." This action serves as a defense mechanism that has evolved over time to protect them from predators. Moreover, conglobation helps these terrestri ...

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How roly-polies can roll into a ball (conglobation) as a defense mechanism

Additional Materials

Clarifications

  • Roly-polies, also known as pill bugs or woodlice, are small, segmented creatures belonging to the group Isopoda. They are not insects but are actually classified as terrestrial crustaceans, related to lobsters and crabs. Despite their appearance and behavior resembling insects, their biological classification places them within the crustacean family. This distinction helps explain their unique features and behaviors, such as their ability to conglobate into a ball for defense.
  • The ability of roly-polies to conglobate into a ball helps seal moisture within their gills, preventing dehydration in dry environment ...

Counterarguments

...

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Short Stuff: Roly Poly...Bugs? | STUFF YOU SHOULD KNOW

Roly-polies eat their own feces to extract more nutrients (self-coprophagy)

Roly-polies exhibit self-coprophagy, which means they consume their own feces in an attempt to absorb nutrients that were not digested during the first pass through their system. This be ...

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Roly-polies eat their own feces to extract more nutrients (self-coprophagy)

Additional Materials

Clarifications

  • Self-coprophagy is the behavior where an organism consumes its own feces to re-digest nutrients that were not fully absorbed during the initial digestion process. This process allows the organism to extract additional nutrients from its waste. It is a common behavior in certain animal species like roly-polies.
  • Roly-polies, also known as woodlice or pill bugs, are small crustaceans that are commonly found in damp environments like gardens and under rocks. They are known for their ability to roll into a ball when threatened, hence the n ...

Counterarguments

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Short Stuff: Roly Poly...Bugs? | STUFF YOU SHOULD KNOW

Roly-polies help with composting and are beneficial for gardens

Roly-polies, also known as pill bugs, woodlice, or armadillo bugs, play an essential role in the gardening and composting process due to their feeding habits and non-destructive nature.

They eat decaying plant matter and dead animals, helping decompose

One of the primary reasons roly-polies are beneficial for gardens is their diet consisting mainly of decaying plant matter and dead animals. This dietary preference enables them to significantly contribute to the decomposition process in compost piles and garden soil. As they feed on organic material, roly-polies help break it down into smaller pieces, which speeds up the decomposition process and enhances soil fertility. This natural cycle ensures that valuable nutrients return to the soil, promoting plant health and vigor.

They don't damage plants or carry diseases

Another advantage of having roly-polies in the garden is that they generally do not harm living plants nor do they transmit diseases. U ...

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Roly-polies help with composting and are beneficial for gardens

Additional Materials

Clarifications

  • Roly-polies are small, segmented creatures that belong to the group of crustaceans known as isopods. They are commonly found in damp environments like gardens and forests. These creatures are also referred to as pill bugs, woodlice, or armadillo bugs due to their ability to roll into a tight ball when threatened, resembling a pill or a small armadillo. The names "pill bug" and "woodlouse" are often used interchangeably to describe these terrestrial crustaceans.
  • Roly-polies, also known as pill bugs or woodlice, are small crustaceans that play a crucial role in composting by feeding on decaying plant matter and dead animals. Their diet helps break down organic material into smaller pieces, speeding up the decomposition process and enriching soil fertility. By aiding in the decomposition of organic matter, roly-polies contribute to the recycling of nutrients back into the soil, supporting plant growth and health. Their presence in gardens signifies a healthy soil ecosystem and their non-destructive feeding habits make them beneficial allies for gardeners.
  • Soil ecology is t ...

Counterarguments

  • While roly-polies do contribute to decomposition, they are not the only or necessarily the most efficient decomposers in a garden ecosystem; fungi, bacteria, and other invertebrates also play significant roles.
  • Roly-polies may sometimes feed on tender roots and seedlings if their preferred food sources are scarce, which can be detrimental to young plants in a garden.
  • In some cases, roly-polies can become overpopulated, and their activity might lead to the over-consumption of organic material, potentially depriving the soil of sufficient organic matter.
  • The presence of roly-polies in the garden is not the sole indicator of healthy soil ecology; other factors such as soil pH, nutrient ...

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Short Stuff: Roly Poly...Bugs? | STUFF YOU SHOULD KNOW

Roly-polies can crystallize heavy metals in their bodies to clean up polluted areas

Roly-polies, also known as pill bugs, possess a remarkable ability to aid in environmental cleanup efforts. They can consume heavy metals such as zinc and lead, and have the extraordinary ability to crystallize these toxins in their bodies. This unique trait could make the ...

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Roly-polies can crystallize heavy metals in their bodies to clean up polluted areas

Additional Materials

Clarifications

  • Roly-polies have specialized cells that can bind heavy metals and convert them into crystalline structures within their bodies. This process helps to sequester the toxic metals, preventing them from causing harm to the organism. The crystallization of heavy metals is a defense mechanism that allows roly-polies t ...

Counterarguments

  • The ability of roly-polies to consume and crystallize heavy metals, while impressive, may not be scalable to the extent necessary for significant environmental cleanup.
  • Relying on roly-polies for remediation could potentially disrupt local ecosystems if not managed carefully, as introducing any species to a new environment can have unforeseen ecological impacts.
  • The long-term effects on the health of roly-polies themselves, when used in polluted areas, are not well understood and could be detrimental to their populations.
  • The bioaccumulation of heavy metals in roly-polies could pose a risk to their natural predators, potentially causing a cascade of ecological consequences.
  • There may be more efficient and controllable methods for remedi ...

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