Why don't all tarantulas homes have an outer burrow?

Not all tarantulas have outer burrows because their habitat and lifestyle can vary significantly. Some species are arboreal or live in open environments, adapting by creating silk retreats or residing in crevices instead of burrowing. Additionally, the availability of resources like soil type and moisture can influence their nesting behavior, leading some tarantulas to forgo a traditional outer burrow. Ultimately, their evolutionary adaptations determine the most suitable living conditions for each species.