You should simplify, thus:Ad-Dabb is a cold-blooded vertebrate alligator-like lizard .
- Ad-Dabb is an alligator-like lizard.
All the rest of that sentence is superfluous (redundant).
I'm not sure what unguiculate means. Is it a noun or an adjective? In any case, you should say it has a spiky tail.It is unguiculate and of a spiky tail almost 30 cm long.
Say:Its color is wheaten--tan,tends to be bronzed .
- It is brown in color, ranging from tan to bronze.
In the first sentence, delete However and burning. Also, a thing can be completely one color or not, but it cannot be both. In the second sentence, delete always and some and put a comma after herbs.However, when Ad-Dabb is exposed to burning sunshines, its color shifts completely to the yellow color as its head still in blackesh wheaten.It always feeds on grasshoppers , some succulent herbs and insects.
Please space after each period (full stop).