Which flea is known to specifically attack poultry and birds?

The Sticktight flea is known specifically for its affinity for poultry and birds. These fleas are often found infesting the skin around the vent and in the feathers of birds where they feed on the blood of their hosts. The Sticktight flea's life cycle and feeding habits make it particularly well-adapted to avian environments, which allows it to thrive in conditions associated with poultry farming and bird habitats.

In contrast, the other options do not target poultry or birds in the same manner. The Grain mite is primarily a pest of stored grains and food products, while the Common bed bug is a significant nuisance in human dwellings, feeding on human blood rather than avian hosts. The American dog tick primarily feeds on mammals, particularly dogs, and does not have a specific relationship with birds. Thus, the Sticktight flea stands out as the correct answer in relation to pests specifically associated with poultry and birds.