Photo of the Day

Scanned by: Retouched by: DT-AY QC'd by: DT-AU GRADES :- A
January 4, 2009

Tree Frog Tadpoles, Costa Rica

Within days of being deposited on a leaf overhanging a stream, tree frog eggs grow into recognizable tadpoles. Bulbous yolk sacs provide nourishment. As the wrigglers develop, the gelatinous outer membrane decomposes, perhaps triggered by a chemical change in the tadpoles. One by one, they slide off to a life of their own in the water.

(Photo shot on assignment for "Nature's Living, Jumping Jewels," July 1973, National Geographic magazine)

Photograph by Paul A. Zahl
Create a free account to continue and get unlimited access to hundreds of Nat Geo articles, plus newsletters.

Go Further

Subscriber Exclusive Content

See how NASA’s new Mars rover will explore the red planet

Why are people so dang obsessed with Mars?

How viruses shape our world

The era of greyhound racing in the U.S. is coming to an end

See how people have imagined life on Mars through history

Create your free account to continue reading

No credit card required. Unlimited access to free content.
Or get a Premium Subscription to access the best of Nat Geo - just $19