"Warm-blooded" is used to describe animals that generate their own heat. Warm-blooded creatures are often called ectotherms. Mammals and birds are warm-blooded; reptiles and amphibians are cold-blooded.Know More
Reptiles and other cold-blooded animals must draw heat form the environment, and they are slower and less active when the temperature drops. They also have a slower metabolism, which is why they often spend long periods of time resting. However, being cold-blooded has an advantage: they do not have to eat as much as their warm-blooded counterparts.
In exchange for their more robust dietary demands, warm-blooded animals are able to cope with a broader range of environmental conditions, but hotter weather is often a greater threat than cold weather. Warm-blooded creatures are able to move at a faster rate of speed than cold-blooded ones. This is part of the reason why mammals and birds can migrate long distances.
Some creatures, however, are not clearly warm-blooded or cold-blooded. The dinosaurs, in particular, seem to straddle this gap. If they were strictly cold-blooded, they would have been far slower than most experts believe. If they were warm-blooded, their dietary needs would have been more than most think is realistic. While there is still a considerable amount of debate, many experts now believe that dinosaurs were neither truly warm-blooded nor cold-blooded.Learn more about Zoology
Most animals without backbones, known as invertebrates, have no tails. Among these are spiders, most insects and frogs. However, every species of mammal has a tail at some point in its development. Human embryos possess tails during their fifth to eighth week of development. In rare cases, humans are born with imperfectly developed tails, which must be removed by surgery.Full Answer >
The animals that live in temperate evergreen forests include black bears, brown bears, deer, elk, small rodents, robins, owls, hares, raccoons, newts, fleas, centipedes, wasps and hornets. In the Northwestern United States and other areas with formidable winters, evergreen forests are home to lynx, bobcats, bison and wolves. These forests are also home to dozens of bird species.Full Answer >
Some animals that eat caterpillars are wasps, reptiles, certain mammals and birds. Of these animals that prey on caterpillars, birds are their main predators. The caterpillar is the larval stage of insects like moths and butterflies.Full Answer >
Not all animals yawn, if only because many large groups of animals lack the basic anatomy necessary for yawning. Tapeworms, for example, are parasitic animals that absorb nutrients through their skin, according to HowStuffWorks, and therefore lack a mouth.Full Answer >