[□] □
[□=□] □
[□ | □] □
Research has revealed that prairie dogs prefer short grass habitat , typical of areas that have been overgrazed by livestock . When the price of tags becomes economical enough , it is expected that RFID will take off in a myriad of areas . Isotope ratios of the fish will serve as internal chemical tags that are characteristic of areas where they are living . We are not short of areas of disagreement and perceptions .