Now you mention squirrels there Toby, I have to tell you about the ones we get in our garden.
We have a few bird feeding stations in our back garden. One of them is a nut-ball hanging on a hook from the top of one of our fence posts. Circular metal cage about 12 inches diameter, with holes for the smallest birds to get through (e.g. Sparrows and Tits), with a wire mesh tube running down the middle which holds the peanuts. The squirrel has a great time trying to get into it, crawling all over the sphere, hanging upside down, but there is just no way it can get in. They're very acrobatic though.
We have another nut feeder in the shape of a lantern. The peanuts are retained by wire mesh, and again the squirrel can't get into it, try as it might.
We have a Niger seed feeder hanging from a hook on a brick wall. The only access to the seed is via very small holes either side of the plastic tube, large enough for only the sharp beaks of Goldfinches and the smaller beaks of BlueTits.
On the lawn itself we have a metal pole about ten feet high with various hooked brackets attached at different heights and angles. On this we have another circular metal cage, about 16 inches diameter, with a central mesh column of nuts, a smaller caged seed feeder and a large tubular seed feeder. The holes on the large cage feeder are larger than the other ball feeder, so the squirrel can get through these. Before we found the ideal position for our feeders, we tried several different positions in the garden for this particular one but the squirrel always managed to get onto it. Either by jumping from the garden shed or fence or by climbing down the house walls. It would also climb up this metal pole to get to the other feeders. The small cage feeder is only large enough for small birds to get through and the large tubular feeder is only big enough for birds' beaks to get into the holes.
Eventually, we moved this pole to the centre of the garden, away from any jumping points, and we bought a squirrel 'baffle.' This is a large plastic dome that attaches to the metal pole about four feet off the ground, with the dome uppermost. The squirrel can then only climb the pole to beneath the baffle but can't get on top of it.
It's great fun watching it try to curcumvent this obstacle. It climbs the pole, and stops to look around to try and see where to go next. The only place is back to the ground. This has been a great success. So, all in all our garden birds can now feed in peace without the squirrel eating all their food.
We used to have a wooden bird table where we placed food for the larger birds we get in our garden - Robins, Blackbirds, Dunnocks, Collared Doves, Starlings, etc., but the squirrel could easily climb up the wooden stand and devour everything before the birds got a look in. So we have stopped using this now.
We have just finished watching the Autumn Watch program on BBC TV, where they built an obstacle course for squirrels, just to prove how doggedly determined they can be to outwit the obstacles to get to the food. Quite amazing.
Anyway, our squirrel visitor/s don't quite seem to gave got the message yet, and still try to get onto our bird feeders. Apart from the amusement they give us, they do not get at any of the bird food.
Laurie.