Raising young in the complex world of jungles takes ingenuity. Parents must become masters of their environment, learning to exploit all opportunities if they are to secure the future of the next generation. In remote Bhutan, a pair of rufous-necked hornbills have a lifelong partnership built on trust and dedication - the mother is imprisoned for 100 days inside a tree, relying on her male to support his family. Meanwhile, in Sri Lanka, a plucky pug-nosed frog shares his home with a huge venomous tarantula. This unlikely duo make a great team - the tarantula acts as a live-in bodyguard, and the diminutive frog keeps their shared space clean. In Jamaica, an ingenious crab mother works tirelessly to raise her brood of minuscule crablets. With scientific precision, she uses what is available in the forest to create the perfect conditions for her nursery pool. Elsewhere, some jungle parents need space to roam, while others are forced to adapt when their habitat changes around them. Crinkle, a cassowary father in Australia, navigates his chicks through new dangers in the oldest rainforest in the world. In the Amazon, forest fires force a tapir mother to seek a new territory where she can find vital life-giving minerals. In China, white-headed langurs literally cling on to life at the very edge of existence. The limestone pinnacles that form their natural habitat have become surrounded by farmland, and they must fight against marauding males for what's left of the forest, which provides both food and a safe place for the young to develop their skills. Remarkable new science shows ancient "mother trees" provide not only for their own offspring, but also for countless other rainforest families in all jungles, from the tops of the canopy right down into the leaf litter. Their influence may be the key to the survival of all of us.