distensible

As expected, the fish responded by ballooning up and by rapidly gulping down water into a distensible stomach.

That neck of his was so very, very long, and though distensible enough on the whole, sometimes he encountered difficulties that it was almost impossible to surmount.

However, they arbitrarily classed as adults all individuals 22.5 mm. in length or larger, having found individuals this small that showed the darkened and distensible throat pouches characteristic of adult males.

What is said of the distensible character of the stomach and alimentary canal?

The disproportionate voices are produced by means of an extra amount of skin on the throat, which is distensible and acts as a drum to increase the volume of sound.