
Zebra Facts: Stripes, Behavior, Habitat & Species
Zebras are striped equines with 3 species in Africa. Discover why zebras have stripes, their social behaviors, habitats, and their important roles in grassland ecosystems.

Ravens are highly intelligent birds that use tools, plan for the future, and remember human faces. Discover raven problem solving, cultural significance, and surprising abilities.
| Attribute | Value |
|---|---|
| Brain to Body Ratio | Among highest in bird kingdom |
| Problem Solving | Matches 7 year old child |
| Grudge Duration | Remember faces up to 5 years |
| Vocabulary | 30+ distinct calls and sounds |
| Tool Types Used | Sticks, stones, hooks they craft |
| Planning Horizon | Plan 17 hours ahead |
| Population | 16 million globally |
| Clutch Size | 3 to 7 eggs per year |
Ravens rank among the most intelligent animals on Earth with problem solving abilities rivaling great apes. These large black birds use tools, plan seventeen hours ahead, engage in complex social manipulation, and remember individual human faces for years.
They plan for the future, a skill once thought unique to humans and great apes. Most remarkably, ravens pass the mirror test, recognizing themselves in reflections. This self-awareness appears in only a handful of species including dolphins, elephants, and great apes.
Ravens craft and use tools with sophistication that astonishes researchers. They bend wire into hooks to retrieve food from narrow tubes, demonstrating understanding of cause and effect. Wild ravens use sticks to probe for insects similar to how chimpanzees use termite fishing sticks.
Ravens engage in complex social behaviors including cooperation, deception, and manipulation. When hiding food caches, ravens check whether other ravens are watching. If observed, they create fake caches to mislead potential thieves, then return later to move food to secure locations.
In Norse mythology, the god Odin kept two ravens named Huginn and Muninn representing thought and memory. These ravens flew across the world each day reporting news to Odin, making them symbols of knowledge and wisdom. Native American traditions feature Raven as a trickster and creator figure with Pacific Northwest tribes telling stories of Raven stealing the sun to bring light to the world.
Ravens possess over thirty distinct calls conveying different meanings plus the ability to mimic sounds from their environment. Captive ravens learn to say words and phrases though less clearly than parrots. Wild ravens mimic wolf howls and coyote calls, possibly to attract these predators to carcasses too tough for raven beaks to open.
People often confuse ravens with crows, but several key differences distinguish these corvid relatives. Ravens are significantly larger at twenty four inches long compared to crows at seventeen inches. Ravens weigh two to four pounds while crows weigh under one pound.
Ravens plan up to 17 hours ahead, saving tools they will need later even when not currently useful
They remember individual human faces for at least 5 years and hold grudges against people who wronged them
Ravens pass the mirror test, recognizing themselves in reflections like dolphins, elephants, and great apes
Wild ravens slide down snowy hills repeatedly for apparent fun, then walk back up to slide again
Ravens bend wire into hooks to solve puzzles, demonstrating understanding of cause and effect
In Norse mythology, Odin's ravens Huginn and Muninn represent thought and memory, flying worldwide to gather information
Ravens rank among the most intelligent animals with problem solving abilities matching 7 year old children and rivaling great apes. They use tools, plan up to 17 hours ahead, understand cause and effect, and pass the mirror self recognition test. Their brain to body ratio is among the highest in birds, enabling complex cognition.
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