In the catbird seat

Regarding your entry "catbird" and "in the catbird seat": a catbird in the States is less well known for it's song than for the fact that they do not make their own nests; instead they lay their eggs in the nests of unwitting "donor" birds. It may well be that the phrase used by Red Barber is in some way based on this fact: the catbird enjoys some special advantage at the cost of others, the nest being its seat.

The gray catbird is not a brood parasite. You may be confusing it with the brown-headed cowbird.