A birdcage (or bird cage) is a cage designed to house birds as pets. Antique (or antique-style) birdcages are often popular as collectors' items or as household decor but most are not suitable for housing live birds, being too small, or of unsafe materials or construction.ood quality cages designed for pet birds are more suitable. Most parrot cages are made or wrought iron and painted with a non-toxic paint referred to as powder-coating. However, the newest trend in the market is cages made of solid stainless steel.
A viewport is a 2D rectangle that defines the size of the rendering surface onto which a 3D scene is projected.
Using viewport, itâs easier to explain. You can create a viewport, select it, and change the scale using viewport scale at the right bottom of your screen. In the past, we have to use zoom scale. But today, itâs very easy after AutoCAD has scale list feature. You can see how it work in YouTube video, go to this viewport tips to see it.