My old art teacher has these little plasticy flamingos in her front yard and almost every night of the week one of them would get stolen.
To fix this, she took one of them, took its legs off, FILLED the plastic body with rebar, made rebar legs, then dug a hole about 6 feet deep then set the flamingos into the hole, and finally she filled the hold with concrete and made it look like the flamingos are standing in a little puddle.
The funny thing is though, people still try and steal them and if they cant rip them out of the ground, then they decide to try and knock them over. they kick them and get a footfull of rebar and one broken toe.
:rofl: