birds with really thin bones
No not all mutations are bad there are good mutations and bad mutations
By colours you mean mutations. Budgies come in many different mutations. This is a good guide to mutations: http://www.budgieplace.com/colors.html
Some mutations can be deadly, harmful, or have no effect. Correct, not all mutations are harmful. Some mutations could even have a positive effect and help the creature adapt.
It produces new varieties .
They can be both good and bad depending on the mutation. Having extra arms may be a good thing if you are an alien, but being someone with extra arms can also be a bad thing. If you are not an alien, having extra arms might not be so grand. Do normal people have extra arms? If you are a person that got offended by this, i am so truly sorry. Bye:)
if you consider an animal turning out to be a different color then what its suppose to be, for the better like blending in to survive
Mutations can change what protein a section of codes for. The production of different proteins would cause different physical development; a new allele or "trait".
Some mutations cause cells to lose control over cell division
More variety in a population.
A third arm wouldn't be bad.
Successful mutations will persist. Mutations usually occur during replication. Some mutations will flourish depending on environmental factors.
DNA mutations can cause genetic disorders such as cancer, Diabetes, and Asthma.