Different types of egg-clustering in snakes. A string egg-clustering of leptotyphlopid snakes represented by Leptotyphlops sylvicolus and its egg clutch (photo taken by Tyrone Ping), B contact egg-clustering of alethinophidian snakes represented by the egg clutch of the pythonid Morelia spilota (photo taken from https://www.bromiespythons.com/post/eggs-are-here).