These worms are huge. I usually buy the mealworms for the garden birds, (which the wrens, robins and blackbirds love). Due to the European shortage I thought I'd try these. It took the robins and blackbirds a week or so to feel comfortable with them as they're so big, but alas for the wrens (my favourite bird) they are too big and now do not even try (it's about 3 weeks later, I bought 1kg and still have 500g left). Need the mealworms back on sale!! For bigger birds they're ok but not for smaller ones However, they all looked great and healthy, so would recommend if you know your animal will eat them.