Questions and Answers
What are rodents?
Rodents are the most common group of mammals in the world, representing over 40% of all mammals with over 2000 species.
Which of the following features are common in rodents? (Select all that apply)
Rodents are all indigenous to North America.
False
What is the taxonomy of rodents?
Signup and view all the answers
The three species of domestic rodents are known as ______ rodents.
Signup and view all the answers
How do commensal rodents perceive light?
Signup and view all the answers
Which rodent is known for being introduced to the New World during the 15th or 16th century?
Signup and view all the answers
What do commensal rodents prefer to eat?
Signup and view all the answers
Study Notes
Description of Rodents
- Rodents constitute the largest group of mammals, with over 2000 species and 28 families.
- They represent around 40% of all living mammal species.
- Rodent history is tied to human civilization, notably linked to the Black Death which significantly impacted population and societal structures.
- Rodents can be both beneficial and harmful: they contribute to economies via fur and companionship while also causing agricultural damage and public health risks.
- They serve as important models in scientific research but are also vectors for numerous diseases.
General Characteristics
- Sizes of rodents vary, from small mice to large capybaras, which can reach up to 4 feet and weigh 120 lbs.
- They are characterized by large incisors that grow continually, requiring constant gnawing to maintain size.
- Rodent feet and limbs are specialized for various functions including digging, climbing, and swimming.
- Classification distinguishes between commensal (domestic) rodents, not native to North America, and native (wild) rodents such as squirrels and field mice.
Taxonomy
- Class: Mammalia
- Order: Rodentia
- Family: Muridae
- Subfamily: Murinae (Old World rats and mice)
- Subfamily: Sigmodontinae (wild mice, wood rats, etc.)
- Family: Sciuridae (includes ground squirrels, tree squirrels, and marmots)
- Family: Muridae
Commensal (Domestic) Rodents
- Commensal rodents adapt closely to human environments and include species like roof rats, Norway rats, and house mice.
- Roof rats originated in Southeast Asia and spread worldwide via trade routes, reaching the Americas in the 16th century.
- Norway rats migrated from Central Asia to Europe, arriving in the U.S. in the late 18th century.
- House mice traveled from Central Asia through trade before reaching the Americas, influencing ecosystems as they spread.
Vision
- Rodents are nocturnal and have eyes adapted for low-light conditions.
- They generally possess poor visual acuity and are color blind, perceiving light primarily in shades of gray.
Taste
- The sense of taste in commensal rodents is highly developed.
- They exhibit a preference for fresh food over spoiled alternatives.
- Some species are particularly sensitive to bitterness or unpleasant substances.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Explore the fascinating world of rodents through these flashcards. Learn about the diverse species, their adaptation, and their significant role in the history of mammals. This quiz offers insights into the order Rodentia and its importance in the mammalian class.
