Endotherms produce their own heat; ectotherms rely on environmental heat. Most ectotherms are cold-blooded while most endotherms are warm-blooded, but there are exceptions. Mammals are endotherms, and reptiles and amphibians are ectotherms.Know More
Ectotherms must absorb heat from their environment to maintain their body temperature, and the weather can have a profound effect on their behavior. However, they do not have to eat as much as their endotherm counterparts. Crocodiles and alligators, for example, can go weeks or months without eating, but they also remain inactive during most of the day and save their energy for eating, mating and protecting their territory. Endotherms, on the other hand, are able to produce far more energy but must eat regularly. Mammals tend to be more active than reptiles, but they must eat far more to survive.
Scientists are still not sure whether dinosaurs should be classified as endotherms or ectotherms. If dinosaurs were cold-blooded, they would have been far slower than many experts believe. If they were warm-blooded, they would have had to eat a tremendous amount of food. Many now believe that dinosaurs were neither true endotherms nor true ectotherms and had a unique metabolism. This may be why they died off while many reptiles and amphibians survived.Learn more about Zoology
Genus and species are part of the biological classification system for living things. A genus encompasses a group of species that are closely related. Species is the most specific level of scientific classification, which typically groups animals that are so similar that, when they breed, they produce fertile offspring.Full Answer >
Reptiles can live both on land and in water, and fish live solely in water. Differences in reproduction, body structure, waste elimination and methods of movement are significant as well.Full Answer >
The primary difference between fish and amphibians is that fish are only able to live in water and amphibians are able to live both in and out of water. Other differences between fish and amphibians include habitat, differences in skin type and the presence of limbs.Full Answer >
While taxonomy is the classification and naming of all living things, systematics refers to the study of the relationships between these living things as they evolve. Taxonomic hierarchy was devised and published by Swedish scientist Carl Linne in 1735. All branches of systematics, such as botany, zoology, microbiology and mycology, are covered under taxonomy. Taxonomy as the science of biological classification is a subdivision of systematics.Full Answer >