A suet cake is a flat, rendered-fat block that sits in a wire cage feeder. A suet plug is the same fat-based mix pressed into a cylinder shaped to slot into a log-style feeder's holes. A seed log is a solid cylinder of pressed seed and nuts held together with gelatin rather than fat, so it won't melt or turn rancid in summer heat the way suet can.
What's Actually in Each One?
Suet cakes and suet plugs are both built on rendered animal fat, often beef fat, mixed with ingredients like corn, peanuts, or sunflower seed, and sometimes dried fruit or dehydrated mealworms. A seed log skips the fat entirely: it's pressed seed, nuts, and corn bound together with gelatin, which holds its shape without melting. That difference in binder is the main reason a seed log holds up better than suet once the weather warms up.
What's a Suet Cake, and What Feeder Does It Need?
The Armstrong Woodpecker Suet Cake is a 300g rendered beef fat cake made with cut corn, red milo, peanut meal, and sunflower seed, priced at $3.95. It's sized for a standard wire suet cage or a hopper feeder with a built-in suet cage, and it's the format most people picture when they hear "suet."
What's a Suet Plug, and How Is It Different From a Cake?
A suet plug is the same fat-based recipe pressed into a cylinder instead of a flat cake. Log Jammer Insect Suet Plugs are sold as a 3-pack totaling 9.4 oz, made with rendered beef suet, ground peanuts, cracked corn, dehydrated mealworms, and peanut butter, priced at $3.95. A plug needs a log-style feeder with holes sized to hold the cylinder rather than a flat wire cage, so the two formats aren't interchangeable with each other's feeders.
What's a Seed Log, and When Would You Choose It Over Suet?
A Woodpecker Classic Seed Log, 36 oz. is made from mixed tree nuts, peanuts, almonds, cracked corn, sunflower hearts, and black oil sunflower seed held together with gelatin, priced at $17.95. Because it isn't fat based, it holds its shape and doesn't turn rancid in hot weather the way suet can, which makes it the better pick for summer feeding or anywhere the feeder sits in direct sun for part of the day.
Which One Should You Use in Summer?
A seed log, if melting or rancidity is a concern. Standard suet cakes and plugs are nutritionally fine year round, but their fat content can soften, melt, or spoil faster once temperatures climb, which is why some brands sell separate no-melt summer suet formulas specifically for warm weather. A seed log avoids that problem entirely since there's no fat in it to melt.
Frequently Asked Questions
Can squirrels eat suet cakes, plugs, or seed logs just as easily as birds?
Yes. Squirrels will eat all three formats if they can reach them, so a squirrel-resistant cage or careful feeder placement matters regardless of which one you choose.
Does a seed log need to be replaced as often as a suet cake?
Often less often, simply because a 36 ounce seed log holds much more material than a 300g suet cake, though the exact timing still depends on how many birds are feeding and how often.
Is suet safe to feed year round, or only in colder months?
It's safe nutritionally year round, but standard suet can turn rancid or melt in summer heat, which is why some brands make no-melt formulas specifically for warm weather feeding.
Do suet plugs fit any suet cage, or only a plug-specific feeder?
Only a plug-specific feeder with holes sized for the cylinder shape. A flat wire suet cage is built for cakes, not plugs, so the two feeder types aren't interchangeable.
Does the gelatin in a seed log pose any risk to birds?
No known risk. Gelatin is simply the binder holding the pressed seed and nuts together and isn't a food safety concern for the birds eating it.
