sentences:  The halteres are yellowish.The females lay their eggs in batches of up to 50 and may lay up to 2,000 eggs altogether.The eggs, which are white with a pair of dorsal longitudinal flanges or wings, can float in liquid and semiliquid decaying organic matter, especially poultry, cow and dog feces, kitchen waste such as the end of putrid potatoes or carrots, silage and compost, cheese, bacon, and drying fish.