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A freshwater aquatic food web. The blue arrows show a complete food chain (algae → daphnia → gizzard shad → largemouth bass → great blue heron). A food web is the natural interconnection of food chains and a graphical representation of what-eats-what in an ecological community.
The brown rat (Rattus norvegicus), also known as the common rat, street rat, sewer rat, wharf rat, Hanover rat, Norway rat and Norwegian rat, is a widespread species of common rat. One of the largest muroids , it is a brown or grey rodent with a body length of up to 28 cm (11 in) long, and a tail slightly shorter than that.
The best-known Rattus species are the black rat (R. rattus) and the brown rat (R. norvegicus). The group is generally known as the Old World rats or true rats and originated in Asia . Rats are bigger than most Old World mice , which are their relatives, but seldom weigh over 500 grams (1.1 lb) in the wild.
Rats are a common food item for snakes, both in the wild, and as pets. Adult rat snakes and ball pythons , for example, are fed a diet of mostly rats in captivity. Rats are readily available (live or frozen) to individual snake owners, as well as to pet shops and reptile zoos, from many suppliers.
This is a feasible strategy to avoid food shortage. It is the habit of collecting and storing both food and nonfood items that has earned the eastern woodrat is other common name of "pack-rat" or "trade rat". [17] Starting in September, the woodrat will start to forage and store food in its midden for use and survival in the winter. [18]
Food chain in a Swedish lake. Osprey feed on northern pike, which in turn feed on perch which eat bleak which eat crustaceans.. A food chain is a linear network of links in a food web, often starting with an autotroph (such as grass or algae), also called a producer, and typically ending at an apex predator (such as grizzly bears or killer whales), detritivore (such as earthworms and woodlice ...
The procedure for training rats to detect land mines was conceived of and developed by Belgian Bart Weetjens. Training starts at four weeks of age, when the rats are handled to accustom them to humans and exposed to a variety of sights and sounds. They learn to associate a clicker with a food reward of banana or banana-peanut paste. They are ...
The central rock rat is one of five rock rat species native to Australia. It is a nocturnal species that forages for food at nighttime. [5] [6] [7] They can range from 10.6 to 14.9 cm (4.2 to 5.9 in) long for the head and body, and around 30 cm (12 in) from head to tail. [3]
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