Upcoming SlideShare. Like this presentation? Why not share! Embed Size px. Start on. Show related SlideShares at end. WordPress Shortcode. Next SlideShares. Arapi i islam.
Srednjovekovni gradovi. Krstaski ratovi. Uspon osmanskog carstva. Related Books Free with a 30 day trial from Scribd.
Related Audiobooks Free with a 30 day trial from Scribd. Empath Up! Rats are found all over the world. For example, the rice-field rat is found in Southeast Asia, the Australian swamp rat is found in Eastern Australia, and the Norway rat, also called brown rats, is found on every continent of the world except Antarctica, according to the Animal Diversity Web at the University of Michigan.
The brown and the house rat are the most common rats in the world because they have taken boats to every country over the past few centuries. House rats typically like warmer climates, while brown rats live in temperate climates.
They typically live anywhere humans live. Many rat species also live in trees. Overall, rats live to forage and mate. Most rats are nocturnal, though the brown rat is often awake day or night. Rats usually stick together in groups called packs. Brown rats are usually led by the largest male in the pack. Other rats may have several dominant males or females in a pack. Rats are omnivores, but many prefer meat when they can get it. House and brown rats usually use humans for their primary food source.
These animals live in groups that typically consist of two to 13 individuals, according to the University of Michigan Museum of Zoology's Animal Diversity Web. The group often includes related adult females, their offspring and a single adult male. Young adult males are usually solitary, but don't often wander far from where they were born. Males have a home range of about 14 acres, while females stay even closer to home, keeping within about a 6-acre radius.
However, nutria in captivity may live up to about 12 years, according to Oregon State University. Nutria have a voracious appetite for wetland plants and will chow down an entire plant — roots, bark and all, according to Animal Diversity Web. The furry rodents will occasionally eat small invertebrates such as insects and snails, according to FWS. But nutria aren't considered picky eaters as they're often caught eating crops such as rice, sugarcane and corn.
Nutria are native to the marshes and coastal lakes in Bolivia and Southern Brazil, according to Columbia University.
Their populations in those locations are kept in check by the seasonal drought-flood cycles. Periods of drought decimate their population, but thanks to their rapid reproduction rate, the nutria are able to recover during the flooding season.
In the s, fur traders brought nutria to the U. But when the fur market collapsed in the mid s, many nutria farmers couldn't afford to keep their animals and released them into the wild.
The nutria not only survived, but thrived in their non-native homes. Today, nutria populations are found across the U. They're also an invasive species in Europe, Asia and Africa due to fur-farm escapees, according to the Global Invasive Species Database. Nutria are now considered one of the most ecologically harmful invasive species on the planet.
Because the animals eat the entire plant, the vegetation are less likely to grow back, according to National Geographic. The removal of the root systems destabilizes the soil around the water, which causes it to quickly erode and become open water.
0コメント