
Crab Facts: Claws, Shells & Secret Behaviors
Crabs are crustaceans found on every continent with over 7,000 species. Discover why crabs walk sideways, trade shells, and grow claws stronger than jaws.

Butterflies are insects with over 20,000 species worldwide. Learn about butterfly metamorphosis, migration patterns, pollination roles, and unique wing structures.
Butterflies are insects belonging to the order Lepidoptera, with over 20,000 species found on every continent except Antarctica. These delicate creatures display vibrant colors and patterns on wings covered with thousands of tiny scales.
Butterfly wings are covered with thousands of overlapping scales arranged like shingles on a roof. Each scale is a flattened hair about 200 microns long. These scales create the brilliant colors we observe through two mechanisms. Pigments produce colors like yellows, reds, and blacks.
Eggs hatch into caterpillars after 3 to 5 days. Caterpillars molt their skin 4 to 5 times as they outgrow it. After 2 to 5 weeks, caterpillars form chrysalises. This transformation takes 10 to 14 days.
Butterflies have compound eyes with thousands of tiny lenses providing nearly 360 degree vision. They see ultraviolet light invisible to humans. Many flowers have UV patterns that guide butterflies to nectar. Butterflies taste through their feet.
Some butterfly species undertake remarkable migrations. Monarch butterflies migrate up to 3,000 miles from Canada and the United States to specific mountain forests in Mexico. Millions gather in small areas creating spectacular concentrations. Painted lady butterflies migrate between Africa and Europe, traveling up to 9,000 miles.
Butterflies are important pollinators, though less efficient than bees. Their long legs prevent them from contacting all flower parts, but they visit many flower species bees ignore. Butterflies prefer flowers with landing platforms and bright colors. They can see red, unlike bees.
Butterflies have existed for at least 55 million years, with fossils showing wing patterns similar to modern species.
Ancient Greeks used the same word 'psyche' for both butterfly and soul, associating metamorphosis with spiritual transformation.
Victorian butterfly collecting became so popular that some species were driven to local extinction by collectors.
Maria Sibylla Merian's 1705 illustrations of butterfly metamorphosis revolutionized scientific understanding of insect life cycles.
Research found butterfly wings are covered in thousands of tiny scales that create color through light refraction rather than pigment.
Studies revealed monarch butterflies can sense Earth's magnetic field, adding another layer to their navigation system.
Scientists discovered caterpillars retain some memories through metamorphosis despite their brains being completely rebuilt.
Genetic research showed some butterfly mimicry patterns evolved independently multiple times across different species.
Butterflies represent transformation, hope, and rebirth across cultures from Mexico's Day of the Dead to Japanese art.
The monarch migration to Mexico coincides with Day of the Dead, when Mexicans believe butterflies carry returning souls.
Butterfly gardens and houses became popular conservation and educational attractions worldwide.
The butterfly effect concept, though from chaos theory, drew its memorable name from the insect's delicate nature.
Before habitat destruction and pesticide use intensified, monarch butterflies numbered in the billions. Their migration created orange rivers across the sky, and overwintering sites in Mexico supported so many butterflies that tree branches broke under their weight.
Monarch populations have crashed by over 80% since the 1990s. Milkweed elimination, pesticides, and climate change have decimated their numbers. Conservation campaigns now distribute milkweed seeds and create butterfly corridors. The species was listed as endangered in 2022, marking the potential loss of one of nature's most spectacular migrations.
Butterfly wings are transparent; color comes from thousands of tiny scales covering them
The Queen Alexandra birdwing is the largest butterfly with a wingspan exceeding 12 inches
Some butterflies migrate thousands of miles across multiple generations to reach destinations
Butterflies taste with their feet to identify nectar and correct plants for laying eggs
The glasswing butterfly has transparent wings that lack the colored scales most butterflies have
Butterflies must warm their flight muscles to 85 degrees before they can fly
Monarch butterfly populations have declined by over 80% since the 1990s due to habitat loss and pesticides
Butterflies serve as indicator species for ecosystem health and climate change impacts
Milkweed planting campaigns aim to restore monarch habitat across their migration route
Climate change is shifting butterfly ranges northward and disrupting migration timing
Butterfly wing structure inspires materials science for anti counterfeiting technology and solar panels
How much do you know? Take this quick quiz to find out!
Butterflies taste with their feet, using chemical sensors to identify host plants for laying eggs.
Some butterflies can see ultraviolet light invisible to humans, revealing wing patterns we cannot detect.
The painted lady butterfly holds the record for longest insect migration at up to 9,000 miles across generations.
Butterfly wings are actually transparent. The colors come from microscopic scales that scatter light.
Some caterpillars can increase their body mass by 1,000 times before metamorphosis.
Butterflies cannot fly if their body temperature falls below 86°F and must bask in sunlight to warm up.
Most butterfly species live 2 to 4 weeks as adults. Some small species survive only a few days while others like mourning cloaks can live 11 months. Monarch butterflies that migrate live 6 to 8 months, much longer than summer generations that live only 2 to 6 weeks. Lifespan varies by species, season, and environmental conditions.
This article is reviewed by the Pagefacts team.
Editorial Approach:
This article reveals the mind bending science of metamorphosis where caterpillars dissolve and rebuild, the mysterious navigation abilities of monarchs who find trees they have never seen, and why butterfly decline signals broader ecosystem crisis.
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