I've done some research, and it's worth noting that pretty much everything called Asplenium nidus is actually Asplenium australasicum. So I should really say it's probably A. australasicum. The difference is based on the sori. They appear as brown, fuzzy, diagonal lines under the fronds. (Your plant may not have sori.) According to the source below, the sori in A. australasicum are half or more the distance between midrib and margin. So basically, I'm thinking it's Asplenium australasicum rather than A. nidus var. plicatum. I've seen larger plants get wavy over time. The source below says the plicatum should be more convoluted. Here is a link that might be useful: Bird's Nest Fern

For anyone in the future looking - while I understand your quandary, you certainly did the best thing for your home and your health. Often birds have mites. Being on a wreath on your front door, chances are the mites would have made their way into your home. My understanding is they are extremely difficult to be rid of (minus a match). Our family found out the hard way about mites. Bird had nested in our primary door wreath when we were away on vacation. We just used an alternate door so as to not disturb them. Thought it would be interesting with the kiddos to keep an eye on how things work. A few days after they hatched, I kept noticing a black smudge on the inside of the door. I'd wipe it off, another would show up. I finally looked really close and saw the smudge was moving! MITES. Birds nest had to be moved immediately! We put it in the closest tree (about 40' away) lt turned out fine as momma found her lil ones. They took flight within a couple weeks, it seems like.

Oh Konrad ,I just went throught this...you gotta shake the heck outta that egg then put it back in the nest. I would have lost all my Chipping Sparrow babies if they had not nested where I could monitor them. This baby grew 20 x faster than the chippers and was kicking the Chippers out of the nest.had I not interviened all the Chipper babies would have died and the Cow bird baby been the only child of the poor Chippers, they will raise it. Read my posts 911 pre fledging of Chippers snd so on..I am glad to say the 3 Chipper babies that jumped out of the nest prematurly have all fledged safely as did the Cow bird baby. (one thread "I cant believe my eyes") will tell the story. Please shake the heck outta that egg...you don't want it to hatch and you don't want the Cow Birds to come with their wrath on the babies that do hatch.

There are some birds that lay their eggs in another birds nest. The Cuckoo, Cowbird, Whyda, Honeyguide and Black-headed Duck come to mind. "These birds, called brood parasites, lay their eggs in another bird's nest and let the other bird parents feed and raise their chicks. The "egg abandoner" is then free to mate again and lay more eggs in another nest. The cuckoo is the best known brood parasite and an expert in the art of cruel deception. Its strategy involves stealth, surprise and speed. The mother removes one egg laid by the host mother, lays her own and flies off with the host egg in her bill. The whole process takes barely ten seconds. Cuckoos parasitize the nests of a large variety of bird species and carefully mimic the colour and pattern of their own eggs to match that of their hosts. Each female cuckoo specializes on one particular host species. How the cuckoo manages to lay eggs to imitate each host's eggs so accurately is one of nature's main mysteries."