ornithologist

orni+logist... so orni sounds like morni(peacock in english) n thologist who studies, therefore person who studies birds

ANOTHER WEAK mnemonic..i hope it helps.. the word can be split into or + nit (net=nest) - represents birds + logist (someone who studies)

ORnithologist: this is kind of weak mnemonic but since there is nothing else so i am suggesting this one; OR rhymes is PAR (feathers of bird) and the words ending with 'logist' denotes that somebody studies it!

studying of birds crow thin thol(skin in tamil)