It looks like a tick to me....they start off very tiny (which is why most people become host, cause they don't notice them) and usually when they are coming out of the nymph stage (size of pencil point dot) is when they are most noticeable. They survive the cold by staying under debris such as matted down leaves, and can be seen in different parts of the US as early as April all the way until September. I live in the woods and thank my birds everyday for keeping the yard pest free. I often check them over for any parasites, as they can be left on the ground by song birds (as they can hitch a ride) that have landed to eat. Not sure which kind you have where you live, but I would just pay close attention to any changes in their activities, so you can determine if the nasty little critter in question didn't make your fowl sick. Hope it all turns out good!