Bird Repellent Spikes - 5 StipsBird Repellent Spikes Our Bird Repellent Spikes are a safe, effective, humane way bird control solution and will not harm birds. These Bird Deterrent Spikes are made of durable weatherproof injection molded plastic. That is not affected by extreme temperatures and will not break. No assembly required. Each bird spike strip can be fixed by screw, zip tie or adhesive tape. Stopping pigeons, sparrows, starlings, crows, blackbirds, grackles, seagulls,