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The drinking bird is a heat engine that exploits a temperature difference to convert heat energy to a pressure difference within the device, and performs mechanical work. Like all heat engines, the drinking bird works through a thermodynamic cycle. The initial state of the system is a bird with a wet head oriented vertically.
The top-hatted “drinking bird,” once a fixture in science classrooms for demonstrating the basics of thermodynamics, is making a surprising comeback — as the inspiration for a new clean ...
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.
Eagle is the common name for the golden eagle, bald eagle, and other birds of prey in the family of the Accipitridae. Eagles belong to several groups of genera , some of which are closely related. True eagles comprise the genus Aquila .
Using this method, accipitrids such as the golden eagle (Aquila chrysaetos), wedge-tailed eagle (Aquila audax), martial eagle (Polemaetus bellicosus) and crowned eagle (Stephanoaetus coronatus) have successfully hunted ungulates, such as deer and antelope, and other large animals (kangaroos and emus in the wedge-tailed) weighing more than 30 kg ...
Unusually, in the Netherlands, birds were the primary food in both number (77.6%) and biomass (72%). [59] Also, in Luxembourg, eagle-owls hunted birds in general more regularly than mammals, as nearly 70% of prey remains there were avian. [107] At least six other species of pigeon and dove have also been recorded as prey.
The ecology of these species is often broadly similar but the tawny eagle usually dominates the bateleur in food competition. The tawny eagle steals food from other raptors in addition to catching its own prey and coming to previously dead food sources. [8] [12] The Afrikaans name for the tawny eagle is a "Roofarend", meaning the "Robber Eagle ...
Providing birds with a safe and warm space is just as vital as extra food at this time of year. "Robins often use nest boxes as roosting sites during the winter, so putting up a suitable nest box ...