Hero shrew facts for kids
Quick facts for kids Hero shrew |
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| Conservation status | |
Scientific classification  |
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| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | Eulipotyphla |
| Family: | Soricidae |
| Genus: | Scutisorex |
| Species: |
S. somereni
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| Binomial name | |
| Scutisorex somereni (Thomas, 1910)
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| Armored shrew range | |
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The hero shrew (Scutisorex somereni), also called the armored shrew, is a large shrew from the Congo Basin in Africa. It looks like a typical white-toothed shrew with short legs and a thin snout. But it has a very unusual spinal column. Its spine has special interlocking vertebrae (backbones). This feature is unique among almost all mammals. Only its close relative, Thor's hero shrew, shares this trait. This strong spine helps the shrew carry a lot of weight. An expedition team once saw it support about 72 kg (159 lb)!
Hero shrews live in both lowland and mountain forests. They hide in the plants on the ground. They mostly eat small creatures without backbones. Scientists are still learning why its spine is so strong. One idea is that it helps the shrew push under logs or palm tree leaves to find food. Some local people believe the hero shrew has magical powers. The IUCN lists it as a species of Least Concern. This means it is not currently in danger.
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What the Hero Shrew Looks Like
From the outside, the hero shrew looks like a normal large shrew. It has short legs, a thin snout, and small eyes. Its fur is thick, coarse, and gray. It has two kinds of fur. Some hairs help it sense things around it. Other hairs produce a special smell. The hero shrew strongly marks its area with this scent. It bends its body to rub its smell on objects. Scientists think this smell keeps other shrews away. The chemical it releases can even turn its fur yellow.
Hero shrews live in forest areas where few people live. This means they are rarely seen by humans. They mainly eat insects. But they also eat small amphibians and lizards in the wild. In captivity, they have eaten bird and mammal meat. A fully grown hero shrew is about 12–15 centimetres (4.7–5.9 in) long. Its tail adds another 6.8–9.5 centimetres (2.7–3.7 in). It weighs between 70–113 grams (2.5–4.0 oz). Male and female shrews look the same. Scientists have not yet seen how hero shrews reproduce.
How the Spine is Special
The hero shrew's backbones, or vertebrae, are thick and bumpy. They fit together tightly on their sides and bottoms. The spine has bony parts that connect like puzzle pieces. This makes the backbone very strong but still flexible. These differences are clearest in the lower back, between the ribs and hips. A hero shrew has 11 lumbar vertebrae (lower back bones). Most mammals only have 5. The hero shrew's spine makes up 4% of its body weight. For other small mammals, it's only 0.5–1.6%.
The shrew's ribs are also thicker than those of similar-sized mammals. Its back muscles are much larger, while its belly muscles are smaller. Because of this, the hero shrew moves in a unique way. Its spine bends like a snake.
In the 1910s, explorers Herbert Lang and James Chapin saw something amazing. Local people in the Congo showed them the hero shrew's strength. After a special ceremony, an adult man, weighing about 72 kg (159 lb), stepped on a shrew. He balanced on one foot for several minutes. When he stepped off, the shrew was unharmed. The shrew's strong spine and curved back protected its organs. This feat was like a human holding 10 elephants! Compared to its size, the hero shrew's spine is about four times stronger than any other animal's backbone. Only its sister species is similar.
Even with its great strength, the hero shrew's spine can bend easily forward and backward. This helps the animal turn around in a burrow (tunnel) that is only slightly wider than itself. However, it cannot straighten its spine or bend it sideways. Its spine is also five times more resistant to twisting than a common rat's spine, when adjusted for size.
Where Hero Shrews Live and Their Status
The hero shrew lives in tropical rainforests in the Congo Basin. It also lives in nearby mountains. It can be found at heights from 700 to 2230 meters. It seems to need forest habitats to survive. In the mountains, it is often found near streams. Its home range includes Burundi, the Democratic Republic of the Congo, Rwanda, and Uganda. However, it does not seem to live west of the Oubangi River.
The IUCN lists the hero shrew as a Least Concern species. This means it is not currently at risk. Scientists believe it has a large population and lives in many places. Its habitat includes several protected areas. So, the hero shrew is not likely to face a big drop in its numbers soon.
Why the Spine is So Strong
Usually, an animal's backbone is one of the parts that changes the least over time. So, why the hero shrew's spine is so different has been a big mystery. Before 2013, there was no good explanation for why a strong spine would help the shrew. In 1974, Jonathan Kingdon thought the strong spine might help the shrew keep its body out of wet ground in swampy areas. Another idea was that the spine just happened to evolve without a clear purpose. Neither of these ideas had strong scientific proof. In 1998, Dennis Cullinane and his team studied the shrew's body in detail. They concluded there was no clear reason for its special spine.
In 2013, a team led by William T. Stanley from the Field Museum offered a new idea. They suggested that Scutisorex might use its super strong spine to lift logs or dead palm leaves. This would help them reach small creatures like earthworms that they like to eat. This behavior has not been seen directly. But local people who collect beetle larvae in a similar way often find these shrews. Scientist Kristofer Helgen called this new theory "the first compelling explanation" for the spine's special purpose.
First Scientific Discovery
The hero shrew was first described in 1910 by Oldfield Thomas. He studied a single specimen found in Uganda. But its unique spinal structure was not discovered until 1917. That's when J. A. Allen examined a preserved specimen from the American Museum of Natural History. The name "hero shrew" comes from the local Mangbetu name for the animal.
Cultural Importance
The hero shrew is highly respected in its homeland. Its amazing strength has led the local Mangbetu people to use the shrew as a talisman. They believe that any part of the shrew, even its ashes, can make a person unbeatable in battle. Local medicine men use the shrew to make a special medicine. This medicine is said to give courage and protect from harm during fights.
