Double yikes! metaldehydeI use Corrys Slug and Sail
Environmental Effects
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Metaldehyde does not present a direct environmental risk to water and soil quality; the compound has a half-life of only several days in soil and is soluble in water. Because it rapidly decomposes to acetaldehyde, it is not persistent in groundwater either (EXTOXNET). However, metaldehyde does pose risks to the health of wildlife.
In addition to laboratory studies on mice and rats, data indicate that the compound is toxic to various other organisms. Although LD50 values, the median lethal dosages, are unavailable for birds, several cases of death have been reported for birds feeding in metaldehyde-treated areas. Likewise, poultry living in exposed areas have shown tremors, muscle spasms, difficulty breathing, and diarrhea. Metaldehyde does not seem to affect aquatic organisms (EXTOXNET). Pelleted baits have been reported to be toxic to multiple organisms. Likewise, these baits are appealing to dogs, and therefore numerous agencies recommend that pets be confined during the application of the chemical.
More here https://toxipedia.org/display/toxipedia/Metaldehyde
Eric