Grumpy Old Geeks Topics Magpie tracker study Topic Magpie tracker study 3 mentions in 1 episode The hosts recount a study in which magpies removed tracking harnesses from other birds. Mentions 542: The Sneaky Leakies Feb 25, 2022 57:50 a mischief of magpies 58:32 their study fell apart in mere days 58:48 most of the other test subjects had been freed of their trackers