Ramsey was visiting the zoo to raise awareness of elephant and rhino poaching.
The record-breaking Swede is out of contract at Paris Saint-Germain in the summer.
Gunners chief is attempt to win his side a third consecutive cup.
The 30-year-old defender was targeted by the Old Trafford club late in the transfer window.
The 25-year-old forward made a dramatic return to first-team action against Leicester City.
The 32-year-old striker moved to Turkey in the summer after leaving Manchester United.
The 49-year-old pundit is expecting an epic clash when the two teams come head-to-head in March.
Wenger was reportedly ready to offer £42m to sign Pierre-Emerick Aubameyang in January.
Both Chuba Akpom and Isaac Hayden are unable to face their parent club.
Wenger says he is going to start a strong team despite the coming games with Barcelona and Manchester United.
Spanish defender has revealed what he thinks of the club's activity in the transfer market.
The Brazilian defender missed the 2-1 win over Leicester City with a hamstring problem.
Chukwueze flies to London to complete Gunners move, alongside teammate Kelechi Nwakali.
The ex-Manchester City defender has hit out at the antics of the title-winning Frenchman.
The Gunners beat the Catalan giants 2-1 at the Emirates Stadium five years ago.
The 26-year-old star is also a reported target of Premier League rivals Arsenal.
Arsenal boss praises his side for their battling display in 2-1 win over the Foxes.
The Gunners secured a 2-1 victory after the Foxes were reduced to 10 men.
Danny Welbeck scored a dramatic winner to give Arsenal three crucial points against Leicester.
IBTimes UK brings you live coverage of Sunday's Premier League football.
Former Spurs boss thinks the north London club could enjoy a period of sustained success.
The 27-year-old midfielder has been one of the key players for the Gunners this season.