The short answer for a king snake
A king snake can have a quail egg, a day-old quail chick, or a change of rodent as a treat meal, offered in place of a normal feed and only once in several meals. This species eats almost anything it can overpower in the wild, including other snakes, eggs, birds, and rodents, so egg and chick treats are genuinely natural for a king snake. The treat must match the size of the meal it replaces, and it never arrives as a bonus on top of a mouse already eaten.
Why variety suits this hunter
A king snake is a generalist constrictor that actively searches for prey rather than waiting in one spot, and that searching habit makes new scents and shapes enriching as well as edible. A king snake working out how to swallow a smooth quail egg, shell and all, uses different jaw movements than it needs for a mouse, which is good mental and physical exercise. Variety also spreads nutrients across prey types, though a king snake on good rodents is not lacking anything. The benefit here is engagement for an intelligent, food-driven snake, not fixing a dietary gap.
Treats that suit a king snake
A quail egg is the simplest king snake treat: smooth, scent-rich, and taken whole, best offered to a snake large enough to manage it comfortably. A day-old quail chick adds feathers and a different shape, and some king snakes take a small reptile egg when available from safe captive sources. Rotating between mice and similar-sized young rats also counts as variety for a king snake without changing the routine at all. Avoid raw meat strips, eggs far too large for the snake, or live vertebrate prey as a spectacle, none of which a king snake needs.
How often a king snake can have them
Keep a king snake's treat feed to one in several regular meals, with its standard rodent diet filling the rest of the schedule. This species is prone to obesity in captivity precisely because it rarely says no, so treat frequency is set by the calendar, not by the king snake's eagerness at the glass. Adults on a spaced feeding rhythm need no extra days added for treats. If a king snake starts striking at the door between feeds, that is enthusiasm, not hunger, and it is not a reason to bring the treat feed forward.
Watch-outs with a king snake
Weigh a king snake periodically and run a hand along its body: it should feel muscular and smooth, with no soft fat rolls when it bends. A king snake that regurgitates a treat meal, refuses food repeatedly afterwards, or shows laboured breathing needs a reptile vet, and egg treats should pause while any feeding problem is assessed. Hygiene matters with a king snake's treats too: wash hands after handling eggs or chicks before touching the snake or its enclosure, and use long tongs, because a food-focused king snake may grab at warm fingers near a scented meal.
Recording treat feeds for an eager snake
A king snake's treat feed disappears in minutes and looks like any other meal in hindsight, which is how treat weeks quietly multiply. A shared feeding record settles arguments about when the egg last happened. In KinsLe Care Teams, the feeder ticks off this king snake's meal and notes the egg or chick, timestamped for the next keeper to see before planning the following feed.