My wife and I enjoy birdwatching. For us it is what the birds do that is exciting, how they live their lives. We enjoy watching the actions of paired birds nesting and raising young. We marvel at the group dynamics within birds of the same kind and how different species interact. It's been a shared passion for almost 20 years now but only recently did knowing exactly what birds we were watching became important. Identifying the birds we saw became an exciting new part of our birdwatching experience. (One made easier and more enjoyable by the good folks at Whatbird.com)
The reason I mention any of this is to illustrate that I may not know
the difference between a Green Heron and Least Bittern but I didn't just
wander into the wetland yesterday. I've been doing this for awhile,
almost a lifetime in fact, long before I met and married a woman with
similar interest in our feathered friends. I've seen a lot of bird
behaviors, a lot of bird relationships and a lot of interaction between
birds of differing species over the years.
On Thursday, September 6th, 2012, my wife and I witnessed inter-species
behavior unlike anything either of us have seen before. It was as
baffling as it was enthralling, made even more so by us knowing the
species of only one type of bird involved - a Mallard. The other was a
mystery to us at the time but thanks to Whatbird users confirming my own
research I now know was a Hooded Merganser. Not that knowing the
mystery bird's identity made the behaviors we witnessed any less
Female Hooded Merganser:
Here is the story of what we saw...
While walking a path in a Hamilton Ontario waterfront park near a
marina on the shore of Lake Ontario my wife and I came across a large
group of Mallard ducks sitting on a rocky stretch of beach in the shade
of some large willow trees. Numerous mallards and other birds live
year-round at the park so seeing a group of mallards isn't uncommon. It
was noteworthy that so many birds were peacefully coexisting in this
group. Usually they keep to much smaller groups - from two to a dozen
There were maybe 50-60 mallards in this group, calmly sitting on the
beach or drifting lazily in the shallow water nearby, water turning
various shades of green due to high algae levels. Seeing mallards in
these and greater numbers is a common sight later in the fall but this
seemed early for these normally quite quarrelsome birds to be hanging
out together. We decided to hang out ourselves and observe the scene...
partly because we were curious. Was it some instinctive per-migratory
flock building (even if they were early and most were probably
'year-rounders' anyway) or perhaps the duty of moulting is better in the
company of others? Did the algae bloom have anything to do with it?
We never did reach a conclusion about why so many mallards were together
in this one spot because a more compelling mystery was revealed when
the ducks became aware of our small dog accompanying us and a number of
them casually stepped into the water. It was then we noticed one of the
mallards wasn't a mallard at all - it was a female Hooded Merganser. At
the time we didn't know what it was but we knew it definitely wasn't a
mallard. We saw it before we actually saw it as the next picture proves.
I took the shot just prior to my wife and I simultaneously spotting the
"mystery bird" (Hooded Merganser) as it entered the water.
We'd seen the sketchy looking Canada Geese in the background of course
but it wasn't until I loaded the photos into the computer at home that
we realized our little mystery bird had been sitting amid the ducks all
We watched and within seconds it became apparent the little bird was
completely at ease among the mallards which were obviously not of its
kind and considerably larger in size. Even more compelling was the
smaller bird's attachment to one particular mallard among the many. It
was a male, a drake. Like lots of waterfowl around the lakefront he was
sporting rather drab plumage lacking the trademark green head of its
kind. The mallard seemed not at all concerned at being closely tailed by
the smaller bird. In fact, the two seemed so at ease and connected in
their movements they appeared almost to be a couple.
We suspected the mystery bird to be female, a guess based mostly on the
uniform overall drabness of its plumage and the 99.9% sure knowledge the
mallard was male. We didn't think it was possible they were connected
with the ultimate goal of raising young but it wasn't beyond the realm
of believable acceptability to consider the possibility they thought
that way. Maybe it was some kind of mutually beneficial partnership, an
alliance of chance or a benign inter-species companionship ignited by
some random genetic trigger. Whatever the reason, it was obvious the
mallard and its little companion were a functioning unit of two amid the
numbers and personal dynamics of the rest of the mallard flock.
The mallard cruised slowly through the water dabbling his bill into the
surface blooms and algae foam and its little companion did the same
despite possessing a bill that looked anything but suitable to the task.
It was thin and dagger-like, it looked serrated, certainly not the
broad, finely molded scoop the mallard had. The mystery bird's bill
looked more predatory than the bill of the mallard, one more akin to a
diet of animal manner than plant stuff.
It was one thing of many that made this pairing so compelling to watch.
The possibility that the mallard might somehow have adopted the mystery
bird came to mind. There were instances, like the clumsy dabbling, which
suggested the mystery bird was learning survival behaviors from the
larger mallard but doubts arose just as quickly... The mallard was a
male. Wouldn't an adoption, however unlikely, at least need the
cooperation of a female mallard? and where was she?
Then there were behaviors which showed the mystery bird was anything but
some weak adopted stepchild, the most obvious of which was captured in
this final photo...
When other mallards came too close to "its" mallard the little mystery
bird went on the offensive with aggressive displays and posturing.
Without fail the mallards yielded to the smaller bird which was
surprising given their proven record for eagerly initiating or accepting
challenges to engage in physical combat. As seemingly aggressive and
possessive of its mallard that the mystery bird was, the mallard was the
leader of the pair. Those aggressive exchanges with other birds ended
with the paired mallard calmly moving from the disturbance and the
smaller bird following, once again a silent mimic of its larger
I've never seen anything quite like it. I know many species of birds and
other creatures can and do join in inter-species companionship and in
some cases have hybrid offspring but it's not something one witnesses
every day. I've never seen a mallard display such a close and obvious
companionship with anything but another mallard.
After arriving home I loaded the pictures from our day at the park into
my computer and began researching the identity of the mystery bird which
led me to the Hooded Merganser, a guess confirmed by Whatbird users. If
anything, learning the mallard's companion was a merganser only raised
more questions. During subsequent research I've learned mallards have
earned quite a reputation for cross-breeding with other species. In some
parts of the world native duck species are in danger of extinction as
hybrids will inevitably erase the rest if bird population numbers reach a
rapidly nearing critical pivot point. I found a number of species
listed as confirmed mallard crossbreeders but no mention of mergansers
hooded or otherwise. Nothing I found indicated hooded mergansers
crossbreed with any species and it seems unlikely they'd do so with
mallards or similar ducks given the difference in diet and feeding
methods. Mergansers are diving feeders whose diet is primarily animal
material whereas mallards feed largely on plant material by dipping and
Even discounting breeding as the reason for this mallard / hooded
merganser partnership it's still a compelling companionship. How did
these two birds come to be a pair? Why did it happen? The answers to
those and other questions remain unanswered, maybe forever but that's
part of the fun of birdwatching. Their are wonders aplenty supplied by
our feathered friends and the lives they lead, it's impossible to know
all the answers (and besides, where's the fun in that?) Knowing we were
witness to something rare and wondrous is enough.
Some may scorn at the birdwatching hobbyist and consider it an exercise
in wasted time and boredom but in that ignorance they are denying
themselves so much. The wonder, excitement and personal fulfillment
found in birdwatching is endless and good for the soul.
Thanks for reading.
If you want to know more about Hooded Mergansers and Mallards check out the links below...
Hooded Merganser Whatbird Profile
Hooded Merganser on Wikipedia
Mallard Duck Whatbird Profile
Mallard Duck on Wikipedia