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Among extant great apes, orangutans climb most frequently. However, Bornean orangutans (Pongo pygmaeus) exhibit higher frequencies of terrestrial locomotion than do Sumatran orangutans (Pongo abelii). Variation in long bone cross-sectional geometry is known to reflect differential loading of the limbs. Thus, Bornean orangutans should show greater relative leg-to-arm strength than their Sumatran counterparts. Using skeletal specimens from museum collections, we measured two cross-sectional geometric measures of bone strength: the polar section modulus (Zpol) and the ratio of maximum to minimum ...

Before I start, allow me to announce that Tet Zoo merchandise is now available! So far, I've only used the Tet Zoo logo for these products, but I might produce additional designs in time.

Whales sing loud enough that the sound travels through the ocean. But how they do that has been a mystery. A new study says whales have a specialized voice box that isn't seen in other animals.

Whales sing loud enough that the sound travels through the ocean. But how they do that has been a mystery. A new study says whales have a specialized voice box that isn't seen in other animals. The study was too tiny to be definitive, but experts say the discovery will direct future research into how whales communicate. The research looked at voice boxes from three dead, stranded whales. Lab experiments showed the whales use a cushion of fat and tissue to sing.

Whales sing loud enough that the sound travels through the ocean, and scientists think it's because they have specialized voice boxes.