Possible danger?

[shoesky]

After spending the day reshingling the coop, we noticed the ladies picking up the loose pebbles that fell off the new shingles! Are the pebbles dangerous to them? I'm sure they were using it as a grit, but we are concerned because of the chemicals used. Any thoughts or ideas?

 

[midget_farms]

probably not good for them, but I doubt if they will get sick. most of the tar will have washed off.