Top 20 Most Common Insects in Santa Cruz
Insects, a diverse group of creatures with remarkable features, play an essential role in the ecosystem of Santa Cruz. From pollination to pest control, their impact is significant in both urban and natural environments. This list presents the 'Top 20 most common insects in Santa Cruz', underscoring how their roles as pests or allies are intrinsically tied to the city's unique environments.
Most Common Insects
1. Monarch butterfly
The monarch butterfly (Danaus plexippus) is the most recognizable butterfly in North America. It is best known for its appearance, but should be better known for the fact that it has a 3000-mile migration that takes the butterfly 4 generations to complete. Their diet is also a natural deterrent for predators, as they eat milkweed, a poison that induces vomiting.
2. Western honey bee
Western honey bee（Apis mellifera） is the most common species of honeybee in the world. Among the first domesticated insects, its cultural and economic impact on humanity has been vast and far-reaching, providing honey, wax and its services as a pollinator. Western honey bee faces challenges worldwide, such as colony collapse disorder, and populations are thought to be decreasing.
3. The striped shore crab
The striped shore crab spends half of its time out of the water, usually hiding in small cracks among rocks. It is well adapted to semi-terrestrial life and said to be able to thrive on land for up to 70 hours. When night falls and its predators are not active, the the striped shore crab emerges out from rock cervices, seeking food.
4. Seven-spotted ladybug
Seven-spotted ladybug (Coccinella septempunctata), known in North America as the "seven-spotted ladybug," is the most common species of ladybird in Europe and the official state insect of five U.S. states. While not native to North America, it has established itself there after being introduced to control aphid populations. Its bright coloring deters predators, and it may also play dead or secrete foul-smelling liquids to discourage consumption.
5. California sister
Adelpha eulalia belongs to the serpa species group in the genus Adelpha (sisters). It was previously treated as a subspecies of Bredow's sister (Adelpha bredowii). Recent phylogenetic studies, however, conclude that morphological, geographical, and genetic evidence make it clear that it is a separate species. 
6. Convergent lady beetle
The convergent lady beetle (Hippodamia convergens) is one of the most common lady beetles in North America, which is a great thing given that it is a common biological control agent of aphids. They lay a good chunk of eggs over a couple of months. If you have ever seen a small, black alligator-like insect, you may have seen one of its larva.
7. Painted lady
The painted lady is a migratory butterfly that spends part of the year in Northern Africa and then migrates to Europe during the warmer months. Although the adults feed on nectar from flowers, the larvae feed on the leaves of nettles and thistles.
8. Common Pill-Bug
The common Pill-Bug is a nocturnal woodlouse species that's fairly popular among hobbyists and sometimes kept as a pet. When disturbed, this small bug rolls into a ball, resembling a pill or armadillo, hence both its Latin and common English names. Compared to other Armadillidium species, this one is able to withstand drought more than any other.
9. Cancer antennarius
10. Western tiger swallowtail
It is a large, brightly colored and active butterfly, rarely seen at rest; its wingspan is 8 - 10 cm, and its wings are yellow with black stripes, and it has blue and orange spots near its tail. It has the "tails" on the hindwings that are often found in swallowtails. The eggs are deep green, shiny, and spherical. Young caterpillars resemble bird droppings, and as they molt, they eventually turn bright green, with a pair of large yellow eyespots with black and blue pupils. The caterpillars molt five times, eventually reaching a length up to 5 cm before pupating.
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