Galahs, also called the rose-breasted cockatoo, are an extremely common parrot found in large flocks all over Australia. It has risen to pest proportions in some areas.
A gallows is a structure designed to cause death by hanging. It was typically used to execute criminals. Depending on how far the person being hanged is allowed to fall, death is caused by either strangulation on a short drop, or by having their neck broken on a long drop.
Ganache is a mix of chocolate and cream. It can be used as frosting or filling for pastries and confectionary. It is made by pouring warm cream over diced chocolate and then stirring them together. Ganache is usually made with two parts chocolate to one part cream for filling, and equal parts for frosting or a glaze.
A gap is a small space between two things, or a small break in something continuous like a fence. A gap can be measured in distance, like the gap between the two buildings in the picture, or it can be measured in time. For example, some people take a gap year between school and university.
A garden is a planned space, full of plants that have been placed by the garden's owner. Gardens can be indoors or outdoors, just for decoration, or for growing fruit and vegetables. Some gardens have plants that are trimmed into shapes, called topiary.