Microphones (various)
4ch
Sennheiser AMBEO VR Mic
Soundfield ST450 mk2
http://www.soundfield.com/products/st450mk2
Schoeps
http://www.schoeps.de/en/products/ortf-surround-bar
SPS200 Zephyx kit - 4ch soundfield mic
Telinga parabolic reflectors
http://www.telinga.com/products/
e.g.
http://www.telinga.com/products/pro-series/microphones/parabolic/stereo-mk2/
hydrophones
Aquarian H2a-XLR Hydrophone
http://www.aquarianaudio.com/h2a-xlr-hydrophone.html
ambisonics
ambiX v0.2.7 – Ambisonic plug-in suite
http://www.matthiaskronlachner.com/?p=2015
richard devine
http://www.creativefieldrecording.com/2017/03/14/explorers-of-ambisonics-richard-devine/
anna bertmark
http://www.creativefieldrecording.com/2017/03/16/explorers-of-ambisonics-anna-bertmark/
https://endabates.wordpress.com/2017/06/19/comparing-ambisonic-microphones/
notes
Microphones for nature recording
https://www.wildmountainechoes.com/equipment/microphones-nature-recording-ii-different-microphones-different-situations/
ultrasonics
using a mobile or ipad >
https://www.wildlifeacoustics.com/products/echo-meter-touch-2
https://www.wildmountainechoes.com/equipment/options-for-recording-ultrasounds/
http://www.avisoft.com/usg/microphones.htm
Microphone Research (2003)
comparison of sony microphones
http://infos.0db.net/micros/compare/indexe.php3
in-ear binaural microphones
http://www.soundprofessionals.com/cgi-bin/gold/category.cgi?category=search&item=SP-TFB-2&type=store