invisible in that he becomes clear. So he casts no shadow or anything, and as long as his second eyelid is closed (so he can still see) and he doesn't open his mouth, he really can't be seen unless you're lucky to catch a ripple every now and again. And yes, I forgot to mention but their intelligence involves speech

and his size was listed in with the picture.
Here's number two...
Lumevita: The black under the eyes works the same way as with falcons, to keep a glare off of the eyes when in bright light. Not too overly energetic, Lumevita is still the peacemaker of the crew. She's in no hurry to start something and walks at her own pace but at the same time can be quite lively but usually in a predictable way. Far slower to anger, but all the more deadly for when she is. Which is helpful when her brother Fulgar is being a pest. She is the elder, having hatched on a bright day while her brother waited until the storm that night to emerge. She can be bio-luminescent, and photosynthesize. Her pupils are usually black but she can focus her solar energy through them and burn things (like a laser but hard to see in day light). More so she uses her energy through her tongue to encourage the growth of plants.