I think of my sheep as animals that I insert into a managed ecosystem, but of course the sheep become part of that ecosystem themselves. I found one of my lambs giving a ride to a nursery web spider (Pisuarina mira) that was carrying an egg sac.
The spider caught my eye as it’s better than 2 inches across. The female carries the egg sac in her jaws (sounds exhausting, but being neither female nor arachnid, I may not be qualified to judge) until the spiderlings are about to hatch, and then she builds them a web to hatch and start growing in. This species doesn’t make a web for catching prey, but instead stalks and overpowers its dinner. More tasty spider details here: http://www.spiders.us/species/pisaurina-mira/.