Yes there bones are about 4k each its good if you are high level.
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if your non member greater demons.If member blue and green dragons are good.
If you have never killed a dragon before I would suggest killing green dragons. They can be found east of clan wars in about lv 23 wild. They drop green dragon hides and dragon bones which together can be sold for about 7k, making them a pretty good way to earn money.
there are many types of dragons on runscape green steel iron black blue and king black dragon.they are all at different strength levels green dragons being the weakest and they are good money for lvl 70 onwards they are in wilderness east of clan wars
Mithril dragons have a 50% green charm drop rate, dropping four charms each time, which is by far the best. All dragons in general have a fairly good green charm drop rate. The higher level the dragon is, the better change of getting charms. Level 96 cave bugs have an excellent drop rate...considering how weak they are. Cave bugs can be almost as good as mithril dragons, but cave bugs only drop one green charm each time as opposed to the mithril dragons four charm drop each time.
Green Dragon Hide
I got my attack up from killing flesh crawlers in the Stronghold for Security, but some people with the right combat level (65-80) could train on Green Dragons, because you can get some good drops and make decent money. Although if you go for the dragons make sure you have an anti-dragon shield. You can get 1 from Duke Horacio in Lumbridge if you did Dragon Slayer.
King Black Dragon, Mithril Dragons, Fire Giants, Kalphite Queen, Black Dragons, Chaos Druid.
Basilisks is a good way to get green dragons i think, but im not sure, i find it a good way. =)
Not possible
If you are a high lvl and you are a member then fight green, red, and blue dragons. They drop things that are worth A LOT. If you are not a member and you are not a high lvl then train on giants in the sewers. They drop good things but not as good as the dragons. Also you can chop wood and roots. They give good xp and the wood is worth a lot but not as much as the dragons.
It can be good and bad. Green is for going green. Save the planet. Green is for money... and to steal and beg for money is greed. green is very good