I had eight honey bee colonies going into winter last year (2014) and all but two of them were destroyed by shrews. The shrews squeezed through the half-inch mesh I’d been using since 2010 to keep mice out. But no one ever told me about shrews. The little buggers easily squeeze through half-inch mesh. They slip inside and pluck one bee at a time from the edge of the cluster. They eat the bee’s innards, toss away the bits of legs and other desiccated body parts, then climb towards the cluster for more… until they eat approximately 125% of their body weight in bees every day, gradually reducing the size of the cluster until the colony is dead.
That’s how I lost six colonies last year. With only one mated queen and no extra brood, I performed a miracle and managed to expand my remaining two colonies into five colonies last summer. They may not be the strongest colonies I’ve ever seen, but they’re hanging in there (so far). All of my hives have quarter-inch mesh covering every entrance now. Shrews will never get anywhere near my bees again.
Looking back on my notes from last year, along with photos and videos I shot and the memory of the experience burnt in my brain, the first sign of a shrew inside one of my hives seems obvious. It’s in this photo from January 5th, 2015:
I noticed some honey or sugar syrup on the bottom board of one of my hives this morning.
Watered down honey or syrup on bottom board. (Feb. 02, 2016.)
I’ve seen this before. It usually happens in the winter when open honey comb contracts in the cold and then expands in the sudden heat of a warm spell and drips out of the cells. That’s all that’s happening. The first time I saw this, I thought a mouse got in the hive and chewed open some honey comb, which is not unheard of. But there’s no way a mouse could get through my quarter-inch mesh.
The buzz of my bees has gotten quieter through my stethoscope in the past couple of weeks. I hope they’re not freezing to death. I don’t think they are. I think they’re just contracting into a tighter ball as the weather gets colder. I saw a sign of life in one of my hives this morning.
Frost around the upper entrance of a hive. Temperature: -20°C / -4°F in the wind. (Flatrock, NL, January 26, 2016.)
That’s frost build-up on the shrew-proofing mesh of the top entrance, frost that came from the respiration of the bees’ inside the hive. Which means they’re alive. I’ve been eager to take a peek inside, but that’s good enough for now.
I removed the shrew-proofing mesh from my hives yesterday so I could clear out the dead bees that have accumulated so far this winter. I reattached the mesh afterwards with the use of a staple gun that produces a loud bang that vibrates through the hive and riles up the bees. But a suggestion from one of my readers changed everything:
“Would it be possible to secure it [the mesh] with drawing pins rather than staples?”
It’s absolutely possible. I did it today, just five minutes ago.
One of three pushpins used to attach shrew-proofing mesh to a hive. (Dec. 13, 2015.)
The drawing pins / pushpins work just as well as staples as far as I can tell. That mesh isn’t going anywhere.
Three green pushpins (instead of staples) used to attach mesh over bottom entrance. (Dec. 13, 2015.)
Now I can easily remove the mesh, clean out the dead bees and reattach the mesh without bothering the bees. I thought I might need to find a different method for keeping the shrews out of my hive for next year. Not anymore. The mesh attached with pushpins instead of staples works perfectly. At least that’s my story for now.
I’m a true believer in moisture quilts as the best overall ventilation and moisture reduction aid for Langstroth hives in the winter. I’m a true believer because I’ve seen soaking wet hives become dry as a bone within a week of having moisture quilts installed.
An emergency moisture quilt that saved this colony. (January, 2014.)
Empty moisture quilts are excellent ventilation aids in the high heat of summer too, allowing the bees to regulate the temperature of the brood nest with less fanning and to cure honey sooner. Moisture quilts are also really cheap and easy to make. Everybody wins. Continue reading →