Your roosters crest will not be in a ball shape, like a hen. The roosters crest will have jagged shoots coming out of it sort of like a tree? lol a hens head is very flat and has Distinct points coming out of it. I have a couple of 3 month olds and one 1 you can clearly see is rooster. If I can...
Found on internet but hope it helps. tells you what it contains and that it is poinsonus
"BRACKEN FERN, BRAKE FERN (Pteridium sp.); fronds; plant contains thiaminase.