Facts about Black Rats
- 10
Excellent climbers, black rats use their long tails for balance and can scale vertical brick walls and traverse thin overhead cables with ease.
- 09
Fleas parasitizing black rats transmitted Yersinia pestis bacteria, which killed approximately 25 million people in Europe between 1347 and 1353 alone.
- 08
The black rat's pancreas produces insulin with a molecular structure nearly identical to human insulin, making them valuable subjects for diabetes research since the 1920s.
- 07
Three to four litters per year with 6 to 8 pups each mean a single black rat pair can theoretically produce over 2,000 descendants within 18 months under ideal conditions.
- 06
Remarkably intelligent, black rats can learn complex tasks in just two trials and demonstrate problem-solving abilities comparable to laboratory mice used in cognitive research.
- 05
During nocturnal hours, black rats produce ultrasonic vocalizations at frequencies between 20 and 100 kilohertz to communicate with colony members in darkness.
- 04
Black rats can jump vertically up to 77 centimeters and horizontally up to 120 centimeters, enabling them to access food sources and escape predators with remarkable agility.
- 03
Infestations of black rats caused the deaths of an estimated 75 to 200 million people across Europe during the 14th century bubonic plague pandemic.
- 02
A black rat's teeth never stop growing throughout its entire lifetime, requiring constant gnawing to maintain them at a functional length.
- 01
Originated in Southeast Asia around 1500 years ago, black rats spread globally via maritime trade and now inhabit every continent except Antarctica.