STEP Hebrew Lexicon: תִּנְשֶׁ֫מֶת

1) an unclean animal of some kind

1a) an unclean bird

1a1) perhaps the ibis, water-hen, species of owl, barn owl

1b) an unclean lizard

1b1) perhaps the chameleon

1c) perhaps an extinct lizard or bird, exact meaning unknown