Hi Dylan,
What you have there is a moth larva, most probably of the Indian meal moth (Plodia interpunctella). It can feed on a lot of dry stored products, like rice, wallpaper glue, raisins and all other dried fruits, nuts, peanuts, beans, cereals, dry bread, dry dogfood or catfood, birdfood, some teas and spices. They can survive the winter only indoors in Middle/Northern Europe, at least in Germany, but have populations in storerooms, supermarkets (allthough these always deny there is such a thing, at least here), at bakers and also in private households.
There are some other possibilities (for example some other meal moth species like Ephestia Kuehniella or Sitotroga cerealella, but those two species are more restricted to grains, flour and grain products) , but Plodia interpunctella is the most widespread (worldwide)and the most polyphagous. Here for example is a website about the species:
http://creatures.ifas.ufl.edu/urban/stored/indianmeal_moth.htm
and there are lots more if you do a google search.
The freschly hatched adults are a small moth with about 1 cm length, the front half of the wings strawcoloured or grey, the end half with a brownish-coppery colour.
If they are somewhat older and slightly worn , this is not evident any more, they tend to be a light grey or greyish -brown all over then.
They are no harm for the birds.
Its definitely no weevil larvae!
The only weevils in stored products are severel species of bean weevils and some in rice, cereals and maize. They all have much smaller larvae which do not leave a single bean or corn , but complete their development in it.
Hope that helps
Jörn