Don’t let their tiny sizes fool you: Insects are the heavy lifters of our planet. With an estimated five to ten million species worldwide, insects make up more than half of all known life on Earth. They’re also the most diverse animals on the planet, varying widely in shape, behavior and function.
This diversity is critical because different species of insects handle different jobs. Some pollinate specific plants. Others break down certain materials. When one species disappears, the work it did often doesn’t get done, creating gaps that ripple through entire ecosystems.
So what is insect biodiversity, and why is it so important? Let’s take a closer look.
Insects belong to a group of animals called arthropods, defined by a few key features:
They’re also the only invertebrates capable of flight. This superpower allows them to thrive in nearly every corner of the world, and it’s made them astonishingly diverse.
Insect biodiversity refers to the variety of insect species on Earth, how they differ from one another and the roles they play in ecosystems. There are an estimated five to 10 million species across approximately 30 insect orders, although the exact number is debated.
Just five of these orders make up about 80% of the entire insect population:
| Order | Examples |
| Coleoptera | Beetles |
| Lepidoptera | Butterflies, moths |
| Diptera | Flies, mosquitoes |
| Hymenoptera | Ants, bees, wasps, sawflies |
| Hemiptera | True bugs, such as cicadas, leafhoppers and bed bugs |
Even within these five dominant orders, the variety is remarkable — from tiny ants to massive beetles.
Insect biodiversity is essential because insects support food production, ecosystem stability and natural balance. For example, more than 300 different crops that we consume are pollinated by insects. And one in every three bites of food you eat depends on their hard work.
When insect populations are thriving and varied, entire systems stay balanced. But when populations decline or certain species disappear, the effects cascade — affecting everything from crop yields to wildlife populations.
Healthy insect populations contribute to:
When it comes to beneficial insects, honey bees often get the spotlight, but they’re just one piece of a much larger ecosystem. Insect biodiversity — and insect ecology, the way insects interact with plants and animals — is essential to keeping ecosystems healthy and functioning.
Here’s why:
Insects are high in protein, reproduce quickly and are sustainable to raise. They create only small amounts of carbon dioxide, making them an increasingly popular food source. By 2030, experts expect human consumption of insects to grow significantly.
Insects nourish countless species, including mammals, reptiles, amphibians and fish.
In fact:
More than 2,000 insects, in both adult and immature forms are edible, including:
Insects are a primary food source for many animals. When they decline, we decline — and entire food chains get disrupted.
Picture this: You’re out in nature. Around you, butterflies flock to bright flowers and bees hum in a hive nearby. Behind that peaceful scene, there’s critical work happening: work that produces much of our food.
Bees, butterflies and moths are examples of pollinators. They move pollen between the male and female parts of plants for reproduction, which produces crops. Crops pollinated by bees account for 75% of the fruits, nuts and vegetables grown in the U.S. Without them, plant reproduction and food production would suffer, and we’d see higher food prices and less variety at the grocery store.
Different pollinators work with different plants. Some flowers can only be pollinated by specific bee species. This specialization means we need diverse pollinator populations to maintain diverse plant life.
Insects like dung beetles are decomposers: nature’s cleanup crew. They break down organic matter and recycle nutrients back into the soil.
Other examples of decomposers include:
These insects help break down organic matter, such as fallen leaves, dead plants and animal waste. This process returns nutrients to the soil, which supports healthy plant growth and maintains soil quality.
Different decomposers break down different materials. Termites handle wood, for example, and dung beetles handle waste. Losing even one species means certain materials don’t get recycled efficiently. Without healthy insect populations, entire ecosystems can begin to break down — often faster than people expect.
Despite their importance, insect declines have reached alarming levels. Nearly 40% of insect species are in decline, and about one third are considered endangered. Scientists point to several major causes:
Entomologists study and protect insect populations by monitoring changes in ecosystems and identifying threats to biodiversity. Their work focuses on:
Through field studies, population monitoring, genetic engineering and data analysis, scientists track insect declines and develop strategies to protect ecosystems.
Wondering how you can do your part? Even small changes, like planting pollinator-friendly gardens or supporting conservation initiatives, can make a difference.
Insect biodiversity represents one of the most important and least visible foundations of life on Earth. These small organisms perform enormous ecological tasks every day, often without our awareness or recognition.
In this article, we learned:
Learning about insect biodiversity helps us protect the systems we all rely on.
So, the next time an insect crosses your path, remember: It has an important job to do.
If you find yourself endlessly curious about bugs, ecosystems and the web of life they support, why not take that curiosity further?
The University of Florida offers entirely online, top-ranked graduate programs in entomology with a range of focus areas that reflect just how diverse this field is:
From insect behavior to conservation and pest management, UF’s online programs let you explore the field while learning from leading experts. If the insects around you spark curiosity, UF might be the perfect place to start.
Sources:
https://www.entsoc.org/advocacy/science-policy/resources/position-statements/insects-biodiversity
https://www.insectlore.com/blogs/butterflies/butterfly-pollination
https://www.epa.gov/safepestcontrol/tips-reducing-pesticide-impacts-wildlife
The on-screen text that opens 2007’s “Bee Movie” — a cult classic — nods to an old, persistent myth: the idea that bees shouldn’t be able to fly. It states: “According to all known laws of aviation, there is no way a bee should be able to fly. Its wings are too small to get…
If you think winter means an icy backyard empty of critters, think again — at least when it comes to insects. Many disappear, but that doesn’t mean they’ve vanished. Some hunker down in hiding, some slow their metabolism and a few even thrive in the cold. Understanding what happens to insects in winter isn’t just…
Gene-editing tools. Pest-fighting flies. Insect behavior breakthroughs. 2025 kept entomologists on their toes. But 2025 also brought serious setbacks. Insect decline continued, especially for pollinators like honey bees. The stinging Asian needle ant has now spread to at least 20 states, and the spotted lanternfly has invaded Virginia. On the bright side, AI and drones…
