These are raw insects. These insects live in the leaves of trees. These insects do a lot of damage to the plant. The tree collects food through the leaves. And the main food of these insects is the leaves of the tree.
In our country mango tree, Spondias mombin rose tree, pomegranate tree, guava tree are more common. These insects eat the leaves. Until all the leaves of the tree are finished eating. Until then they do not go to another tree. If it is beautiful to look at. These are deadly harmful insects.
My idea may be wrong. These can also be butterfly larvae.
Thank you so much.