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Animals such as chameleon , frog , flatfish such as the peacock flounder , squid and octopus actively change their skin patterns and colours using special chromatophore cells to resemble their current background , or , as in most chameleons , for signalling .
 chameleon, peacock flounder
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 chameleon, peacock flounder