Question

who is the engine ? what is meaning of "she stokes it full" ?​

Answer 1

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Just as the engine starts up the machine, her arrival in the nest has suddenly started up the silent machine i.e. the young ones have started chattering and making noise. The expression 'She stokes it full' means that she has fed the young ones who now have the energy to become active and make noise.

Hope it helps ☺️☘️