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I found the same in this book, published just over 100 years ago. The book appears to be the result of some pretty rigorous study, so I expect it is a reliable source. On page 294, it refers to the gizzard as an involuntary sphincter, and again on page 302 it refers to the grinding of food in poultry as involuntary. In fact it says that because poultry ...


Involuntary. The gizzard, like our stomachs, works unconciously. However, chickens do choose to peck up stones to help along the process, whether that is by instinct or otherwise. (I raised chickens a long time but a proper reference is below) This book on commercial poultry raising says involuntary


I know first hand that Diamond, a tame Pionus chalcopterus, will sometimes respond to having his head and neck scratched in an interesting manner: he may make "panting" or "huffing" noises unique to this activity, lean his forehead or beak against my hand, and half-close his eyes. I'll add to Ryan's answer by pointing out another use of preening: peeling ...


Dinosaurs is a very broad term which includes both the ancestors of birds as well as modern reptiles. But that analogy stretches as far to say that a bird is a modern dinosaur and a reptile is a modern dinosaur but a bird is not a reptile. Both of their ancestors lived during the cretaceous period and tend to get lumped together. Another analogy would be ...


Short answer Birds emit infrared. Background Objects with a temperature higher than the background emit detectable infrared (IR). Endothermic (warmblooded) animals keep their body temperatures at around 37oC and given the relatively cool temperatures at the earth's surface, endotherms generally emit more IR than the background. Endothermic animals include ...


Hummingbirds absolutely eat insects, and HONEY and BROWN SUGAR are a huge NO NO. The following is a statement from: http://wildbirdsonline.com/index.html Every year, as more studies are completed, we learn more about hummingbird life and diets. However, we find that some people think that hummers can survive on nectar alone. Nectar provides quick ...


The jumping behaviour of the jumping gorfous may come from the sea. These penguins are sea birds. Like many penguins, they are "at home" when in the sea but they are ill-at-ease when on land. These penguins make big jumps above the sea, and then a huge jump from the sea onto land. Then they keep jumping on land... [Edited : Link to video.]

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