I have noticed every year that at certain times of the day, especially from about 12.30 to 1.30, there is a marked increase in numbers. In winter at least no five minutes passes without one or more birds appearing, but at mid-day, and again to a lesser extent just before it begins to get dark, they seem literally to swarm.
I have found that all tits, as well as sparrows and robins, prefer a mixture of bread and fat to fat alone. During February and March, 1897, I weighed all the bread and fat consumed on the food-stand and found that it was as nearly as possible eleven pounds. Lately I have added cocoanuts to the bill of fare; they are appreciated by the tits, but blackbirds, robins and thrushes prefer the bread and fat mixture, or rather they do not seem to care at all for the cocoanuts.
It is curious to see how quickly birds discover that food has been put out on the stand. One year, after the receptacles had been empty for weeks in the summer, I put in some fat, and in less than five minutes a tom-tit was there. Another time I made a longish block of wood, bored nearly through with holes, which were filled with fat smoothed off level with the surface. This block was hung with the holes downwards, so that from above it could look like a bit of wood only. It was hung up at 10.30 a.m., and at 11.30 a tom-tit had found it out, and was eating away at the fat as he clung to the block back downwards.
Tom-tits, unlike great-tits, bully one another most unmercifully. They can recognize each other at a great distance. A tom-tit on the food-stand seems to know at once whether another arriving on the nearest tree, some ten yards or more away, is his superior or inferior in prowess. Sometimes he will ruffle up his feathers as if in resentment at threatened intrusion, at other times he is prepared to make way at once. As is the case with a herd of cows on a farm, the relative standing between them seems to be an acknowledged matter and is seldom contested. To us a couple of tom-tits appear as like as two peas if we have them actually in the hand, and though it is easy to understand that they can themselves distinguish differences at close quarters, and may have some other sense than we have to help them, yet it is a marvellous thing that they can do so without doubt or hesitation at a distance of yards.
The whole question as to how birds recognize one another is very interesting. We know that a shepherd can tell one sheep of his flock from another as easily as we can distinguish between two men, but in the feathered face of a bird there seems to us so little room for difference of expression, and, generally speaking, if we take feather by feather the description of one bird will apply equally well to any other of the same species.
Tom-tits as a rule make way for a great-tit, but I have seen them fight occasionally, and the tom-tit does not always come off second-best. They are complete masters of both marsh and coal-tits, neither of which dream of resisting them. They pay scarcely any heed one way or another to sparrows or robins.
Both tom-tits and great-tits in the flush of their spring-time ardour pay to their chosen helpmates the same delicate attentions as do robins. It is always a pretty picture to see them present their offerings of food, but with tits it seems a rather more business-like matter and to lack something of the tender sentiment so plainly shown by the robins.
Though not nearly so plentiful as tom-tits, both marsh and coal-tits are with us more or less all the year round. Of the two, perhaps the marsh-tit is the more regular, sometimes a pair seem to make the garden their headquarters and to be always about, but several years may pass without our seeing one coal-tit; then they will become almost as common as tom-tits for a year or so, when again the number will dwindle down to, it may be, a single pair.
Some years ago all four kinds of tit used to come together to the food-stand, but (with the exception of a pair of coal-tits in the winter of 1910-11) since 1899 tom-tits and great-tits have had it all to themselves, neither marsh nor coal-tits have been there, though both are still frequent visitors to the garden at all times of the year.