The Heath Natural Pure Suet offers a quick source of high energy for your backyard birds, which have a very high metabolism. Suet is a high-energy formulation of animal fat that is traditionally used to attract birds that do not normally come. A quick source of high energy for your backyard birds. An excellent cold weather substitute for insects on which birds usually feed. Guaranteed not to turn rancid. Unattractive to squirrels, better bird activity. Highest quality beef tallow means a higher melt point for year round feeding. Rendered Beef Suet.: Size: 11 oz.