How Big Can a Tick Get?
Ticks are disease-carrying parasites that feed on blood. They will suck the blood out of both humans and pets alike and transmit diseases between them in their feeding process. Their size and coloring will vary depending on their current life cycle, as they have four cycles: Egg, larva, nymph, and adult. Ticks are arachnids, but they only develop their eight legs during the larva stage, having only six before reaching the next cycle.
Larvae are very tiny, only reaching up to 1/32 inches. Nymphs are still small and hard to spot, reaching up to 1/16 inches. Adults will vary around 1/8 inches. Keep in mind that these sizes are referring to them when they are entirely unfed.
Ticks require blood to feed, and they need to feed to evolve into their next life cycle, starting from their larvae state. When they feed, they suck the blood out of their victims, and they suck a considerable amount of blood for their size. As they feed, you can watch them getting progressively bigger as the sack on their back gets swollen with the blood they just sucked, altering their size considerably depending on how much they ate, making them very plump.