**warning: graphic photos at the bottom of this post!
Bird rehabbers have been battling for years the idea of putting things like hair, string, yarn, etc…out as nesting material for birds. Another perfect example of why that is a horrible idea. Two mockingbird (Mimus polyglottos) chicks brought to us last night. One dead, one alive (cat found them, but that is a whole different conversation). Tied together at the knee by some kind of string. Lower leg completely dead. Had to be euthanized for a few different reasons. By permit, any bird that has to have a leg amputated has to be euthanized. We have no say in that matter. One legged birds develop all kinds of problems. Yes, we have seen one legged birds in the wild too.
Anywho… If you must put something out as nesting material for birds, use grasses, hay, etc… makes a much better and safer solution. Plus it’s natural, and in most cases free!
Fun fact: the mockingbird is the state bird of Texas (1927), Florida (1927), Arkansas(1929), Tennessee (1934), Mississippi (1944), and is the former state bird of South Carolina (1939-1948).