The American White Ibis is a very common bird. You may have seen a group of them passing through your yard using their beak to probe for insects. The males tend to be larger with longer beaks. They breed along the Gulf Coast and when not breeding they drift further inland and to the Caribbean. These birds are monogamous and both parents help to take care of the young. Aside from garbage the larges threat to these birds is methylmercury that leaks into the environment. This alters the hormones in the birds and interferes with their reproduction and breeding. Methylmercury concentrations are increased when waste and fossil fuels are burned. Resevoir flooding can also cause in increase. This chemical is a neurotoxic and also inhibits part of the endocrine system. It prevents males from producing sex hormones that would lead to courtship behaviors. Courtship behaviors are very important in most birds. Without these behaviors the females will not find an interest in the males and reproduction will not occur. It can also lead to females abandoning their nests and reduced foraging.
Other threats include harvesting of their food source such as crayfish, hunting, degradation of habitat, and other chemical uses. If you see these birds passing through, know that they will help your yard by removing pest insects. If you see smaller brown ibis, those are juveniles. Have you seen Ibis around your house?