Birds are difficult to classify because they must be categorized by their genetic makeup. Sometimes there are over eight classifications for a specific bird.
lichens, corals, viruses, corals, viruses and carnivourous plants are difficult to classify :)
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because eugleana is hard to classify
they are not made up of cells
Body Coverings
Archaeopteryx is considered difficult to classify because it possesses characteristics of both dinosaurs and birds. Its fossils show features like wings and feathers, common in birds, but also traits like teeth and a long bony tail seen in dinosaurs. This mixture of attributes makes its classification a topic of debate among scientists.
As an emu has feathers and a beak, it belongs to the group 'birds'
Peregrines have characteristics that classify all birds of preysharp talons (claws) sharp beaks and keen eyesight.
Because it has evolutionary features of both non-avian reptiles and birds.
Many paleontologists now classify birds as dinosaurs, but other than that, no.
current and wind patterns
because Dominic Simpson vanner had fun time with them