On Wed, 03 Feb 2010 12:29:32 +0000, Usenet Nutter wrote:

They use aerosol stuff I believe but with squirrels that might be
difficult seeing as they are quick wee devils.

They do for the ownership marks but there is also a powder/solid that
is tied around the waist or applied to the belly of a ram to mark the
back of the ewes.

--
Cheers
Dave.