A Titanoboa is tamed by dropping fertilized eggs on the ground near it and waiting. It ignores unfertilized eggs completely, and it picks up one egg every twenty seconds. How much an egg is worth depends entirely on the creature that laid it: the harder that creature is to tame, the more its egg counts. A good egg wins twice, because it both cuts the number of eggs you need and costs less effectiveness each time. Eggs from a Bronto, Carcharodontosaurus, Acrocanthosaurus or anything else that is itself hard to tame are worth the maximum, so use whichever of those you can spare. A Dodo egg is worth barely a tenth as much and will leave you feeding it for hours at almost no effectiveness.