When scared, ferrets will hiss; when upset, they squeak softly. Some species of salamander emit a quiet squeak or yelp if attacked. Its firm texture when cooked causes it to squeak on the teeth when being chewed. Fresh curds squeak against the teeth when bitten into. Morphic is the basis for the standard user interface of Squeak and Pharo Smalltalk. A low-pitched squeak may be uttered while feeding. They use leaves to amplify the kiss squeak sounds they produce. Beaker communicates in a nervous, high-pitched squeak that sounds like "Mee-mee-mee mee". The voice is a high-pitched squeak. In 1927 the Pip, Squeak and Wilfred club began. The popularity of "Pip, Squeak & Wilfred" was immense. Version 1.4 of Scratch was based on Squeak, which is based on Smalltalk-80. Black pudding, baked beans, and bubble and squeak are also often included. Marv also has a wiener dog named Sizzles and a pet mouse named Squeak. If captured, "C. variegatus" may squeak and may discard its tail.