An inch of rain water is equivalent to 15 inches of dry, powdery snow.
Tarantulas do not use muscles to move their legs. They control the amount of blood pumped into them to extend and retract their legs.
The popular name for the giant sequoia tree is Redwood.
The California redwood - coast redwood and giant sequoia - are the tallest and largest living organism in the world.
Hydrothermal vents, fractures in the sea floor that spew sulphur compounds, support the only complex ecosystem known to run on chemicals, rather than energy from the sun.
Wine grapes, oranges, figs and olives were first planted in North America by Father Junipero Sera in 1769.
The saltiest sea in the world is the Red Sea with 41 parts of salt per 1,000 parts of water.
Arrowroot, an antidote for poisoned arrows, is used as a thickener in cooking.
Rainforests act as the world's thermostat by regulating temperatures and weather patterns.
Certain species of male butterflies produce scents that serve in attracting females during courtship.