The Intelligence of Corvids
Corvids, a family of birds that includes crows, ravens, and jays, are considered one of the most intelligent bird groups. Their intelligence is often compared to that of primates, and they have been observed exhibiting complex behaviors such as problem-solving, tool use, and social learning.
IELTS Reading Passage:
The intelligence of corvids has been extensively studied in recent years. One of the key findings is that corvids are able to use tools to obtain food. For example, crows have been observed using sticks to dig up grubs from the ground, while ravens have been seen using rocks to crack open nuts. This ability to use tools is not limited to just a few individuals, but is widespread across the corvid family.
Another area of intelligence that corvids have been found to excel in is problem-solving. In one study, crows were presented with a puzzle box containing food. The box had a small hole in it, but the crows were unable to reach the food through the hole. However, the crows were able to figure out that by dropping stones into the box, they could dislodge the food and obtain it.
Corvids have also been observed exhibiting complex social behavior. For example, ravens have been seen engaging in play, such as sliding down snowy hills or playing with sticks. They have also been observed showing empathy towards each other, such as comforting a distressed group member.
IELTS Reading Questions and Answers:
Answer: Corvids.
Answer: By using sticks to dig up grubs from the ground.
Answer: Stones.
Answer: Empathy and play.
Answer: The intelligence of corvids, including their ability to use tools, solve problems, and exhibit complex social behavior. The Intelligence of Corvids Corvids, a family of
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On a rain-silvered morning in late autumn, Mei found a small notebook beneath the eaves of her rooftop garden. The cover was flecked with mud and feathers, and inside the first page someone had written in careful looping script: "For the curious mind — observe."
Mei, a student of animal behavior, lived in a narrow apartment that overlooked an old elm where crows gathered each dawn. She opened the notebook and read accounts of surprising corvid cleverness: a crow that used a stick to pull a worm from a drain, another that dropped nuts onto a crosswalk and waited for cars to crack them open, and a pair that coordinated to distract a dog while one raided a bakery's trash.
Inspired, Mei decided to test their problem-solving with a simple experiment. She placed a shiny button on a low table and watched. The crows arrived in a black, gossiping cloud. One crow, smaller than the rest, hopped onto the table, tapped the button with a toe, and hopped back. The button triggered a small compartment of peanuts. The flock erupted in triumphant caws. Over the next week Mei adjusted the task: they had to pull a string, push a lever, and later, to combine steps in sequence.
She kept careful notes. The crows learned faster than expected. Older birds taught juveniles; mothers nudged beaks to show technique; subgroups of crows specialized — one became expert at tasks involving ropes, another at manipulating small objects. Once, when Mei hid the peanuts in a transparent box with a lid, a crow named Slate pushed another juvenile toward a stick propped against the lid. The juvenile used the stick to lift one edge and free the food. Mei observed what she later wrote in her notebook: "Not imitation alone — guidance."
News of her experiments spread in the neighborhood. People began leaving puzzles and food, and the elm became a living laboratory. Mei met Mr. Alvarez, an elderly clockmaker who had watched the same flock for decades. He told stories of crows recognizing human faces and remembering who had been kind. "They repay favors," he said, polishing a brass gear. "And they keep grudges."
Mei tested that memory. Once, she accidentally trapped her hand in a drawer while refilling a feeder; a crow, frightened by the sudden motion, dropped a pebble to make a loud sound and flew off. In the days that followed, a black sentinel perched on the balcony and watched Mei with narrowed eyes. When Mei dropped a piece of cloth by mistake, the sentinel would skitter forward with a scolding caw, as if reminding her of the earlier alarm. The crows' behavior was not only clever but socially nuanced.
One winter evening a fox appeared under the elm. The crows, sensing danger, executed a complex defensive maneuver. Some flew low and circled the fox, while others created a false scent trail by scattering leaves and dropping food elsewhere, drawing the fox away. Mei marveled at the strategy. It wasn't merely instinct; it resembled planning and cooperative deception.
By spring, Mei compiled her observations into a public talk. She described episodes, measured learning rates, and proposed that corvid intelligence had three intertwined components: individual problem-solving, social learning and teaching, and long-term memory for people and places. She argued that these abilities conferred ecological advantages — accessing new food sources, avoiding humans who posed threats, and coordinating group defenses.
At the lecture, a young schoolteacher raised a hand. "Can crows innovate?" she asked. Mei smiled and recounted how a crow scraped tar from a rooftop into crumbs and used it to attract insects — a novel tool-and-bait technique she had never expected. The audience murmured. What is the name of the bird family
Months later, Mei received a package containing the muddy notebook. Inside, on the last page, was a note: "We watch you as much as you watch us. — A friend." Mei looked up at the elm, where the flock had settled into evening chorus. One crow cocked its head, as if acknowledging her. The human world and the corvid world had become partners in curiosity: a shared experiment that revealed intelligence not as a solitary spark but as a web woven from memory, culture, and cooperation.
IELTS Reading-style questions (with answers)
Which of the following was NOT described in the notebook Mei found? A. A crow using a stick to get a worm B. A crow dropping nuts onto a crosswalk C. A crow solving a maze D. A pair that distracted a dog while one raided a bakery's trash Answer: C
What experiment did Mei first try with the crows? A. Teaching them to speak words B. Placing a shiny button that released peanuts when tapped C. Building a maze with food at the end D. Training them to fly through hoops Answer: B
According to the story, how did older crows influence younger ones? A. They competed for food. B. They taught and guided juveniles in tasks. C. They ignored them. D. They stole food from them. Answer: B
What evidence suggested that crows had long-term memory for people? A. They followed Mei everywhere she went. B. They avoided the neighborhood completely. C. A sentinel watched Mei after a frightening incident and scolded her later. D. They built nests on Mei's balcony. Answer: C
What tactic did the crows use to distract the fox? A. They attacked it physically. B. They fled and hid. C. They scattered leaves and dropped food elsewhere to create a false scent trail. D. They lured it into a trap. Answer: C
Which phrase best summarizes Mei's three proposed components of corvid intelligence? A. Flight, feathers, and food B. Problem-solving, social learning/teaching, long-term memory C. Singing, nesting, and scavenging D. Strength, speed, and stealth Answer: B
Why did Mei receive the muddy notebook again with a note? A. To ask for payment B. To warn her to stop the experiments C. As a sign that the crows (or someone observing them) were acknowledging the partnership D. To return it because it belonged to the library Answer: C
TRUE/FALSE: The story states that crows only rely on instinctive behavior. Answer: FALSE
Which word best replaces "nuanced" as used in "socially nuanced"? A. Simple B. Complex C. Loud D. Quick Answer: B Answer: Corvids
What new behavior did the teacher ask about during the lecture? A. Whether crows can fly at night B. Whether crows can innovate C. Whether crows can mate with other species D. Whether crows build tools from metal Answer: B
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Corvids don't use the same tool for every task; they modify. Similarly, IELTS rewrites the passage. For every keyword in a question, imagine 2-3 synonyms.
6. tool manufacture
7. abstract
8. transitive inference
Summary: Corvids display intelligence through tool use and memory. New Caledonian crows can (5) ______ tools, as seen when Betty made a hook. Meanwhile, scrub jays demonstrate (6) ______ memory by recalling the decay rate of different foods. This ability to remember (7) ______ events was once thought to be uniquely human.
Word Box: A) random B) manufacture C) semantic D) episodic E) past F) future G) observe
Standard Answer Key: 5. B (manufacture) 6. D (episodic) 7. E (past)
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