What about a gerund like "hunting?"

I suppose if the -ing form was used as a noun, it'd be OK., But remember those forms are sometimes adjectives. Cf. His hunting days are over with Hunting gave him great joy.

1. On hatching, the chicks scramble to the surface and head bush on their own.

2. On hatching, the chicks scramble to the surface and head hunting on their own.

For me both sentences are weird, but then I don't savvy Strine.

Ceci n'est pas un seing.