What could have produced this?

Question

When topping up my bird feeder, I could not help but notice this somewhat gargantuan poo by the feeder's pole. About the most exciting large birds I see around our garden in Finchampstead are Buzzards, Red Kites and the odd Carrion Crow. Can't say I've seen any gulls or large geese that might produce this. Only the normal wood pigeons. 
 It certainly impressed me. Don't fancy it on my car's windscreen.

Mike B · Answer

Unknown said: 
 When topping up my bird feeder, I could not help but notice this somewhat gargantuan poo by the feeder's pole. About the most exciting large birds I see around our garden in Finchampstead are Buzzards, Red Kites and the odd Carrion Crow. Can't say I've seen any gulls or large geese that might produce this. Only the normal wood pigeons. 
 It certainly impressed me. Don't fancy it on my car's windscreen.

Something I've not seen for too many years, a worm cast...&hellip;.

Sparzdos · Answer

I'm late to the party, but this is likely pigeon or dove poo. I find several of these in my yard every day where I feed the neighborhood birds. The area where 3 types of doves (Mourning, white-winged and Eruasian Collared) and some Gambel's Quails congregate to eat is where I find these large specimens. Pigeons and doves are part of the same family, Columbidae.