Four framed hand colored copperplate engravings of birds, late 18th century

Comprising:

Blue Heron-lower margin reading Heron bleuatre a ventre blanc, de Cayenne, upper left margin reading 350, "Demi Egret Heron" written in pencil below,  

Canada Goose-lower margin reading par Martinet to the left, Oye, de Canada in the center and upper left margin reading 346, "Canada Goose" written in pencil below

Collard Turtle-lower margin reading Dessine & Prave Pour Martinet to the left, LaTourterelle a collier in the center, upper left margin reading 244, "Collard Turtle" written in pencil below

Common Turtle- lower margin reading  La tourterelle, "Common Turtle" written in pencil below, upper left marging reading 394

All framed in modern gilt frames.