Section 5 Restriction of ringing and marking
If, save as permitted under this Act, any person—
rings or marks any wild bird, other than a bird mentioned in paragraph (b) below; or
not being an authorised person, rings or marks any wild goose or wild duck or any pheasant, partridge, grouse (or moor game), black (or heath) game or ptarmigan,
he shall be guilty of an offence against the principal Act and if that offence is committed in respect of a bird included in Schedule 1 to that Act, he shall be liable to a special penalty under that Act.
So much of section 4(l)(c) of the principal Act as makes lawful the taking of, or an attempt to take, any wild bird, if the bird is taken or to be taken solely for the purpose of ringing or marking that or some other bird and then releasing it, shall cease to apply—
to any bird other than a wild goose or wild duck;
to anything done by any person other than an authorised person.