It's natural for male chams to defend their territory. As for settling down, how long have you had him? It can take a cham a month or so to get comfortable in a new home. If it's been longer than this he's either just a touchy guy or he's being stressed by too much handling or other commotion around his cage during the day. If he is an adolescent he may be feeling his hormones kicking in and be asserting himself. Chams that are being stressed or disturbed too often can be quicker to react to you than chams who feel they have more privacy when they want it. More plants are definitely better, but again, every time you change the cage around he's got to bend his brain around the "new" space. Also, most chams bluff rather than follow through and bite every time. Bluffs work pretty well as you have found out! You can also teach him that you are not a large funny looking predator by offering him favorite insect snacks by hand.

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