Sathyabhama Das Biju is an unearther of the earth’s forgotten stories. He sniffs out links between the genetic codes from the beginnings of life and the present to give us a picture of the cosmic cycle of evolution, extinction and maybe even rebirth.
When, two years ago, he dug up an earthworm-like legless amphibian of the chikilid family in the deep forests of Meghalaya, he was holding in his hands one of the few living species that shared the earth with the dinosaurs. That discovery, published last fortnight in the Proceedings of the Royal Society of London after strenuous scientific scrutiny and recognised protocols, has proven that India’s forests are a treasure trove of evolutionary secrets.
In 2003, Biju and his team had given science another wonderful story of survival from the Jurassic age. The purple frog (Nasikabatrachus sahyadrensis), which he discovered in the Western Ghats near Idukki in Kerala, also shared space with dinosaurs and survived through four mass extinctions. Amphibians were the first creatures to venture on land, having evolved from fish. These early amphibians are the progenitors to all contemporary species, including reptiles, mammals and birds. They are the key to unlocking nature’s big secrets, an incredible cache of information and survival skills that puts human achievements to shame. Today, there are three overarching families of amphibians: salamanders, frogs and caecilians.
For 30 years, Biju has been scouring India’s forests, searching for the secrets that lie hidden, for species that could connect us to the advent of life, for a little squeak in time’s silent aeonic theatre. “I go to see the forests. I watch the rains. I wait. I listen. If the frogs don’t croak, that is also a question to be asked. It is not necessary that you will see or find something new. Nature will come to you. For me, spending a night time in a forest listening to the call of the frogs is eternally fascinating,” says Biju, sitting in the systematics lab of the Centre for Environment Studies in Delhi University—flanked on all sides by formaldehyde bottles of creepies and crawlies.
Biju’s purple frog and the chikilidae (a variety of caecilian) may have survived over several millennia because they are burrowing amphibians and live underground, cushioned by the soil. The chikilidae of the Garo hills, whose ancestors would have been trampled underfoot by the dinosaurs, can burrow through the toughest soil using their hard skull and can vanish at the slightest vibration, a valuable survival skill. As Biju says, “It’s like a rocket. If you miss it the first try, you will never catch it again.”
The purple frog, the first frog family to be discovered since 1926, also burrows with its snout nose, lives underground and sucks up food. The male only comes overground to mate. This purple frog and the chikilidae both lived in the southern supercontinent Gondwana, of which India formed the eastern end. When tectonic shifts forced the continents to split and drift apart about 120 million years ago, such hitherto proximate species drifted away too.
Safe in their hidden homes, they survived for millennia, staying unseen even to science’s prying eyes. For many years, locals in the Garo hills thought the chikilidae to be small snakes. Today, 32 per cent of amphibians face extinction. Biju and the Lost Amphibians of India initiative are working to conserve them, but the large-scale destruction of forests are driving most to extinction, especially in the Northeast. Amphibians make up the highest number of critically endangered vertebrates in India.
It has been four long months of classwork for Biju. He says, “In two months, I will start again: this time in the forests of Central India. People ask, ‘What will you find there?’ But you have to work against the common thinking. I have to go there and see.” Who knows, somewhere in the darkness of the forest, he might hear another cry, a squeak, or a croak that will get his adrenaline flowing again. Science may have to make room for yet another new species... and then, to pull it back from extinction.