UPVC windows are cleaned with water and vinegar mixed in a sprayer. Jupiterimages/BananaStock/Getty Images. Unplasticized polyvinyl choloride, or UPVC, is a rigid and chemically resistant plastic used often in window and door frames.
Clutch size: 35-50 eggs. In April or May, the female crocodile will build a nest of loose dirt in a mound by the water's edge and lay her eggs. She buries the eggs and fiercely guards her nest. When the eggs hatch in July or early August, the female helps carry her young to the water.
Egg production. 1  Most birds have only one ovary and one oviduct. 2  In early stages of embryonic development, each female bird has two ovaries; only the left one develops into a functional organ. 3  In some birds, such as hawks, the right ovary and oviduct usually develop.2005) found that the dinosaur produced eggs in some ways like a crocodile and in other ways like a bird. Crocodiles have two ovaries enabling them to lay a clutch of eggs. Birds have a single ovary and lay only one egg at a time.