Yesterday my 3 Cayuga ducks got onto an uncovered veg plot and eat an unknown amount of slug pellets. We gave them milk to drink as we thought it would at least line their tummy's. I saw all 3 this morning and they were fine, but just got home and Ella is not right at all. She's very unsteady, shaking, and keep shutting her eyes. She's got herself to water and is floating there as the moment. Is there anything I can give her, or do for her? I don't understand how she can be fine this morning and down hill so quick. I'm also worried about my other 2 ducks. Should I leave her on the water, or put her in a quiet dark place?