frame structures making bird hides frame structures making bird hides frame structures making bird hides frame structures lansbury lawrence lesson 2 frame embly kapow primary frame structures making bird hides year 6 exploring frame structures frame structures making bird hides year 6 exploring frame structures frame structures introduction types science 7 s structures topic 1 lesson 2 building structures kapow structures frame structures year 6 exploring frame structures frame structures introduction types grade 4 natural science technology struts frame structures